Time To Question Time: Part Two

Time is the most mysterious concept that you are likely to think about. You know exactly what time is, unless you actually have to explain it and then things bog down. If you admit that time is pure puzzlement, well you’re not alone as the nature of time has been endlessly debated by thinkers, good, bad and average, ever since humans had the ability to think. Okay, I’m a thinker, so here are my thoughts in Q & A form about time.  

Continued from yesterday’s blog…

Q. Is time travel to the future possible?

A. Time travel to the future is easy – you’re doing it right now at the rate of one second per second – boring – or when you fall asleep (or pass out drunk), next thing you know you are in the future, ahead by several hours. You’ve skipped or jumped over some interval of time. That’s what one usually means by travel to the future. It is jumping over some significant interval of time without having to experience or live through it, like say going from 2013 to 2015 and avoiding 2014 entirely. Of course when you arrive in the ‘future’, be it the following morning or by skipping 2014, it’s no longer the future but the present – the ‘now’. It’s actually impossible to be in or to exist in the future, it’s only possible to head towards the future, which you do anyway at the rate of one minute per minute. 

I guess you could construct a philosophical argument that relative to your point of view of yesterday, if you say skipped a day and landed in tomorrow, you are now in the future, but such convolutions don’t get us very far since the you that existed yesterday no longer has any existence or meaning either today or tomorrow or post tomorrow. In fact, the person you call “you” that existed one second ago has now come and gone and passed away into history. The only you that has any reality is the person you call “you” that exists right now.

Apart from your normal modes of time travel into the future, you can accelerate the process. There’s also Einstein’s Relativity twin paradox whereby relative to an outside observer, time, as in rate of change, slows down for someone who is travelling at velocities that are approaching some goodly fraction of the speed of light. So, a twin who heads off at a rapid rate of knots and boldly goes, when returning to meet and greet her stay-at-home twin, will find that though twins they might be, their ages are now different. The stay-at-home twin has aged more quickly, or the boldly going twin has aged more slowly depending on your ‘relativity’ point of view, which isn’t really a paradox, rather the consequences of what happens when you travel at a very rapid rate of knots relative to someone who doesn’t.

However, the same philosophy or argument from those several paragraphs above applies in that you, in this case the you that’s the boldly going twin, is never in the future, only in the now or existing in what passes for the present (along with your stay-at-home twin). That applies even if that present is tens of thousands of years after you were born, which is possible (and thus your stay-at-home twin has long since died and returned to dust). No matter which way you slice and dice things, you only have reality in the present that you find yourself in. 

Q. And what do you conclude about the viability of time travel to the future from the above?

A. Ultimately, to my way of thinking, time travel, even to the future (by skipping over periods of time), is impossible since again time is a concept and not a thing, like a road or a river you have to travel continuously on, up and down on. If time is just a concept, then time travel is illogical.

Q. Is there any other likely impediment to time travel?

A. Yes there is. When you visualise standard time travel stories or films to the past or to the future, your time machine or device keeps you firmly attached to the same set of terrestrial coordinates from which you started, so if you say start in New York City (2013) and go plus or minus say 200 years either to the future (2213) or to the past (1813), you’ll end up in the New York City of that time. That’s bonkers! In that 200 years, either way, Planet Earth on which New York City is attached, but you are not, has moved. Planet Earth is attached to the Sun (gravitationally) and the Sun is in orbit around the Milky Way Galaxy, which itself is moving in space, so when you materialize 200 years in the past or future, the odds are extremely likely that you will materialize into the depths of outer space! Even if you ignore all that, the Earth will not make an exact number of solar orbits and axis revolutions over 200 years to bring you back into exact alignment with the terrestrial coordinates you started out from. So, you just might materialize smack dab in the middle of the Atlantic Ocean. Oops! What one really needs is a time and space machine like the Doctor’s TARDIS where you can also set spatial coordinates. 

Q. Have all billionaires been time travellers to the past?

A. Maybe! It’s easy to imagine looking up say all the long shot horses who won their races in say over one particular year. Now travel back in time to that year and start placing reasonable bets on each ‘long shot’ (that proved a sure thing), make a super-bundle of loot, and hop back to your own era; your own present day and start living the good life. Of course there are many, many variations on this go-back-in-time and get-rich-quick schemes.

Q. We spend our entire lives in the “now” moment, and eternal “now”, yet each “now” moment lasts way less than a nanosecond before the “now” you vanishes into the limbo-land of the past only to be replaced by the future you that was just a theoretical probability that now becomes reality, for just a nanosecond before that you too slips away into the unreachable past. That’s confusing!

A. There’s no real mystery here. There are many examples from daily life of the difference between the continuum and the part of the continuum.

You’re driving along the road in your car. Your car is the continuum since you’re always in your car for the duration (that eternal “now”); the specific section of road you are travelling over is your nanosecond “now” which changes from nanosecond to nanosecond.

You’re swimming with the current in a river. The surrounding water is your eternal “now”; the section of riverbed you’re passing over is your nanosecond “now”. Or, you can reverse the scenario. If you swim exactly against the speed of the river current or flow, the part of the riverbed you are stationary over is now your eternal “now”, while the patch of water around you is ever changing and thus becomes your nanosecond “now”.

If you walk across the stage with the spotlight on you, the light is your eternal “now” but your place on the stage is constantly shifting – your nanosecond “now”.

If you lie in bed all day (and night), the bed is your eternal “now”, but the ticking of the clock, even if only via the changing position of the sun (in the day) and the stars (in the night), or that change from sunrise to sunrise, is your nanosecond “now”.

Note that all of the examples involve motion. Motion is change and change is what the concept of time is all about.  

Q. Does God exist within time or outside of time?

A. There is no God (or gods) so the question is immaterial, irrelevant and has no bearing on the proceedings. But if there is a God(s) they would exist inside of time since to exist is to undergo change and time is nothing but a measure of change. 

Q. When do I exist?

A. Now, and only now. The “you” that existed an hour, even a minute ago is no longer. That past you, actually all those entities you called you (plural) that existed in the past have been consigned to the history books. The “you” that (probably) will exist an hour or even a minute from now, actually all those entities you will call you (plural) that will exist in the future do not yet have reality of any substance.

Q. So again, what is time?

A. One heck of a metaphysical mess!

Time To Question Time: Part One

Time is the most mysterious concept that you are likely to think about. You know exactly what time is, unless you actually have to explain it and then things bog down. If you admit that time is pure puzzlement, well you’re not alone as the nature of time has been endlessly debated by thinkers, good, bad and average, ever since humans had the ability to think. Okay, I’m a thinker, so here are my thoughts in Q & A form about time.  

Are you confused about time? If so, join the crowd. I’m part of that crowd, and I’m confused, but I’ll try to work through my befuddlement via this hypothetical question and answer session which hopefully will enlighten me and you too. 

Q. What is time?

A. Time is a concept, like Wednesday is a concept.

Q. A concept of what?

A. Change. Without change the concept of time is meaningless.

Q. What properties does time have?

A. Time has no properties, just like Wednesday has no properties. Time has no structure or substance; no mass or energy, no colour or spin or charge, it has no associated field, and it exerts no force and has no fundamental particles associated with it. 

Q. Does time have a beginning? Will time ever end?

A. No. Time is eternal. An eternal time removes those nasty philosophical questions of what came before; what comes after?

Q. Can time be created?

A. The concept of time can be created, but only by the mind blessed with some degree of sophistication, but that does not give substance and structure to time itself, any more than the JFK concept of ‘landing a man on the Moon and returning him safely to Earth before the end of the decade’ in and of itself made it so. The concept of a lunar landing is not a real lunar landing. Time itself cannot be created like a soufflé since there are no ingredients that collectively comprise time.

Q. Can time be destroyed?

A. Since time cannot be created, time cannot be destroyed. While that is similar to existing conservation laws, there is no conservation law in existence for time like there is for matter and energy since, unlike matter and energy, time cannot be altered from one form to another, since time is not a thing.

Q. Was the Big Bang event 13.7 billion years ago the start of time?

A. No. Since time cannot be created, the Big Bang banged in existing time which means there was a before the Big Bang. Something had to cause the Big Bang (a change) and that something could only have been an earlier event which happened in already existing time, since an event, a change, defines what time is.

Q. Where does time exist?

A. The concept of time exists only where change exists, and change only exists within that ongoing, yet ever paper-thin slice that we can the “now”. Change neither exists anymore in the past nor does it exist yet in the future.

Q. Are time’s related terms also concepts?

A. Absolutely. None of the following can be placed on the lab’s slab; none of the following are ‘things’, just mental concepts and conventions: past, present, and future; when, now and then; before and after; second, minute, hour, day, week, month, seasons, year, decade, century, millennia, and eon; any of the named days of the week; any of the names of the seasons; any digit that represents a year (i.e. – 2013); any date; yesterday, today and tomorrow; birthday, anniversary and holiday; weekend and weekday; noon and midnight.  A clock or calendar or metronome can be put on the lab’s slab, but a clock, etc. isn’t time, just like a thermometer isn’t temperature, and a Geiger counter isn’t radioactivity.

Q. Is time travel to the past possible?

A. Yes and no.

Einstein’s concepts of General and Special Relativity allow for time travel to the past (and the future), the usual scenario is via a rapidly rotating massive object that can twist space-time around in a loop where the starting point that joins up with itself to form the loop, like a snake swallowing its tail, isn’t any longer at the same point in time. However, the flaw I find with all of that is that this requires space and time, or space-time, to be a thing, which IMHO it is not. Space-time is a concept without substance and structure because both space and time are concepts without substance and structure. Be that as it may.  

The basic argument against going back in time is the creation of a paradox, something along the lines of killing your mother when she was a young girl thus preventing your very existence which means you couldn’t have gone back in time and murdered your mother, etc. Hells, bells, why not just do the suicide properly and go back in time a few months and kill your own self! But any trip back in time will create conditions back then that did not originally exist, and however minor, not only will they become an established part of history, but have that butterfly or ripple effect on down the line – chaos theory. If those new conditions, thanks to your time travelling presence, did not originally exist and now they do, that’s also a paradox as something cannot be and yet be at the same time, and that contradiction extends on down the line as history unfolds differently.

Further, you MUST go back in time (no free will in the matter) to ever create and ensure the conditions that came to pass back when, new conditions that you initially caused – only you never initially caused them since there’s an infinitely recycling causality loop here. You went back in time which caused a certain set of conditions which become a part of established history which means at some point in your life you are required to go back in time to create that certain set of conditions which become a part of established history, all to be endlessly repeated for all eternity. Presumably you couldn’t even commit suicide before you travelled back in time and thus break the cycle.

Of course if the past were somehow changed, then presumably you’d never know it since all records, including those of your memory, would be altered accordingly. But things would be messy if millions of people each travelled back in time and altered this, that and the next thing. History textbooks and other records would be rewritten and altered to conform to all those alterations every second. Then too, what if someone went back in time and altered history to the extent that mankind went extinct as a result – that’s the ultimate going back in time and killing your mother as a young girl!

Here’s a novel concept. Say it is the 10^th of the month. Go back in time to the 1^st of the month and meet and greet yourself. The both of you now wait until the 10^th of the month and then go back in time to the 2^nd of the month where you both can now meet and greet and join up with the other two of you that existed then. Then the four of you wait until the 10^th of the month and the four of you travel back in time to say the 3^rd of the month where the four of you link up with the four of you that existed on the 3^rd. The eight of you now wait until the 10^th of the month and then travel back in time to the 4^th of the month where you group together as a crowd of sixteen. Wait until the 10^th of the month and the sixteen of you travel back to the 5^th and join up with the other sixteen to form a mob of thirty-two, and so on and so on. Starting with just you, you could create an entire army of you!

Q. Where’s the paradox in creating an army just out of you?

A. The paradox here is that you are getting something for nothing, in this case extra copies of you. Where in fact does the extra matter and energy come from that creates that you army?

Q. Anything else?

A. Another reason time travel to the past is suss is that we don’t see any time travellers from our future paying us a visit. Though Einstein’s Special and General Relativity allows time travel to the past, and although the laws of physics are time invariant (they are valid from past to future and future to past), no visitors. Either our descendents don’t have any interest in us, or perhaps there aren’t any – descendents that is – if we go extinct or go back to the Dark Ages sooner rather than later. Or, perhaps time travel just isn’t possible after all or is in the too hard basket.

Q. You lie! What about the Second Law of Thermodynamics?

A. Ah yes, what about the Second Law of Thermodynamics which is held responsible for time’s arrow or the arrow of time (i.e. – things proceed from past (which you remember) to future (which you don’t remember). But the Second Law of Thermodynamics is misnamed since the second ‘law’ isn’t really a ‘law’, just a statement of probability, albeit extremely high probability. When things happen in a statistically probable way (eggs break or scramble; eggs don’t un-break or unscramble) that’s the arrow of time that we perceive. Put in a more thermodynamic context, a boiled egg cools off and heats up the kitchen until both are at the same temperature; the kitchen doesn’t cool down and transfer that energy to the raw egg and cook it.

Q. Anything else?

A. Yes, another postulate has it that one cannot travel further back in time than the time the time machine was constructed. So if our descendents come up with a first ever time machine in the year 2113, they couldn’t come visit us in 2013, though those living in the year 2213 could go back to 2113 (but no farther back).

The way out of that is what about an advanced extraterrestrial civilization’s time machine, say built in 2013 BCE, or over 4000 years ago. Say, what about those pesky UFOs? Instead of ET coming here from out there in their and our present, they come here from there in our present but from their future! The only problem with that is that UFO events and flaps are not clustered around what we would call historically important events, like say the Trinity A-Bomb test in 1945 or the launch of Apollo 11 in 1969 or the sinking of RMS Titanic in 1912. Of course, that they are conspicuous by their absence, well that just maybe our parochialism coming to the fore. Time travelling aliens may have a differing agenda. 

Aliens aside, you could easily imagine a time travelling Travel Agency existing several hundred years from now conducting guided tours to important historical events of their (and our) past, say tours in groups of one hundred per. After several thousand such tours, say to the battle of the Alamo or to Custer’s last stand at the Little Big Horn, things would be getting a mite crowded since each tour has to show up at the same place and date!

Q. And what do you conclude about the viability of time travel to the past from the above?

A. Ultimately, to my way of thinking, time travel, at least to the past, is impossible since time is a concept and not a thing, like a road or a river you can travel up and down on. You can travel in a car, but not in the concept of an automobile.

To be continued…

Profound Things & Concepts

There are many things and concepts within the collective worldviews of humanity that are considered pretty mundane. However, there’s certainly a collection of things and ideas which rise to the top in profoundness when compared and contrasted with the ordinary everyday routine. These are the sorts of profound things and concepts which keep you awake at night, pondering the Big Issues. No two people will come up with identical lists. Without further ado, here is mine. 

1) There Is Something Rather Than Nothing! Why is there something rather than nothing? Let’s say there’s a 50-50 probability between a universe that contains nothing and one that contains something. Or even make the ratio 60-40 or 99-1 or even odds of a billion to one, as long as the probability of a something universe isn’t zero. Then, well that’s something to be said for a something universe. Now a nothing universe isn’t bio-friendly and a something universe can be, so since we’re a friendly bio-entity that must mean we live in a something universe. So, as far as we are concerned, that’s what there is something rather than nothing, because if there was nothing we wouldn’t be here to ponder the issue. Still, it’s one of the most profound and debated topics in all philosophy.

2) 95% of the Universe is Missing! If you add up all of the matter and energy in the Universe that is required to account for actual observations about the Universe, well, those in the know come up short – to the tune of 95% short in actual fact! The missing stuff is divided into Dark Matter (27%), which we know exists because of it’s gravitational influence though it doesn’t interact with electromagnetism (like light); and Dark Energy (68%) which we know exists because the expansion rate of the Universe is increasing, ever increasing. To accelerate the stuff of the Universe to ever faster velocities requires energy, hence the phrase “Dark Energy” – its energy Jim, but not as we know it. In a nutshell, we haven’t a clue what Dark Energy actually is; we have no idea exactly what Dark Matter is. Therefore, 95% of the Universe is missing, well that’s not really true. It’s not so much missing as astronomers have no rational explanation for Dark Matter or Dark Energy. What we have are two profound anomalies.

3) Black Holes! Black Holes are profound because nobody has the foggiest idea what actually transpires inside. What’s the substance and structure inside the Event Horizon? The equations break down that one normally relies upon for such insights. When the mystery is ultimately solved, no doubt the resolution will be a profound one.

4) The Universe Is Bio-Friendly! Our Universe is a Goldilocks Universe if you will – which doesn’t of necessity imply the Universe was deliberately fine-tuned for bio-friendliness, just that there are many more options for disorder than for order, so to there are many more ways to envision a bio-unfriendly not-just-right-for-life Universe than a just-right-for-life cosmos.  

5) Extraterrestrial Life! Either we are alone in the Universe or we have cosmic company. Either scenario has profound philosophical implications. Related to that profound concept is the profound observation that advanced intelligent extraterrestrial civilizations, assuming advanced intelligent extraterrestrial civilizations, should be bloody obvious, having already visited us. Where is everybody? That’s the profound observation (or lack of observation) known as the Fermi Paradox. If they exist, we should know about it. 

6) Now! “Now” is the only period where anything can happen. The past (what has happened) is unchangeable; the future (what will happen) is yet to be. And there are more “now” moments in one standard second than all the numbers of all the humans who have ever lived and are currently alive to boot. That only “now” has any real significance is a pretty profound idea. Fortunately, “now” is an ongoing process.

7) Why Is It So? The electron and the proton have an equal and opposite electromagnetic charge. You cannot determine from first principles what the properties of the Universe, or the fundamental particles that make up the Universe, are. They apparently can have free range. A proton is 2000 times more massive than an electron, but you can’t calculate that from the theoretical laws, principles and relationships of physics. It’s only determined experimentally. There doesn’t seem to be any reason why the proton couldn’t have been 0.2, 2, 20, 200 or 20,000 times the mass of an electron. The same applies to the relative forces. The theoretical laws, principles and relationships of physics do not require an opposite yet equal value of charge between the negative electron and the positive proton. Presumably the value of each could have been as far apart as their masses – that is a proton could have been 2000 times as positive as the electron is negative. Why not? There’s no reason why not apart from the fact that the Universe as we know it then wouldn’t work, but then we wouldn’t be here to worry about that or what might have been. 

8) Wave-Particle Duality! The general picture here is that when a particle is given off, it is in fact a particle – a little billiard ball is emitted. When a particle is absorbed or detected it is in fact a particle that’s detected – a little billiard ball. What about the in-between times? Well, then apparently the little billiard ball undergoes a phase transition into a wave. Now I don’t believe for a moment that the particle actually turns into a nebulous or undefined maybe-here-maybe-there smeared out wave. It’s weird enough that it waves around though truth be known the ‘wave’ is actually a wave of probability. The little billiard ball, well it’s most likely to be in this vicinity or in this volume of space, a bit less likely to be over there, though some say that means there’s a tiny percentage of probability that it’s now on the other side of the Universe – which is nuts since that would imply superluminal velocities. The best analogy that springs to mind is that when the baseball leaves the pitcher’s hand, it’s a particle and when it impacts the catcher’s mitt, it’s a particle, but in-between it’s like a wave – a knuckleball, a slider, a spitter, a curve, etc. The batter (and sometimes the catcher) has to estimate the probability of where that baseball-particle actually is so as to placing the bat (or the mitt) in the right place at the right time. 

9) The Concept of Infinity! There are many things claimed to have (or have had) the property of infinity, though that cannot be. Things like infinite temperature at the Big Bang, or infinite density of the singularity inside a Black Hole. Nonsense isn’t profound. What is profound however - concepts that logically could be infinite. I refer in particular to the concepts (not things) that we call space and time. There’s no reason that if you headed off in a particular direction, that you could not just keep on keeping on without end. There’s no reason that if you headed off in a particular direction, that you could not just keep on keeping on for all eternity. There’s no requirement for there to be an alpha or omega in space or in time. In general you cannot indefinitely divide things, but you can when it comes to non-things or concepts, like the idea of a line that can be chopped into smaller and smaller segments indefinitely, or say of time. Of course not all not-things make logical sense in terms of dividing them. You can’t split Xmas indefinitely or the concept of a car.  

 

10) Self-Awareness! It’s not too difficult to comprehend increasing levels of complexity, from fundamental particles to atoms to molecules to 3-D structures of substance. However, while one branch of increasing complexity (or organisation) – dust and gas, debris, stars and planets, galaxies, clusters of galaxies – doesn’t achieve self-awareness (to the best of our knowledge anyway), another branch undergoes a phase change on the organisational road that’s ever upwards. That’s a change from structures with substance that have no self-awareness (like a rock) to structures with substance that are self-aware (like a bird or mammal). Exactly how that phase change has been accomplished is still one of those profound mysteries. Related, your brain, and my brain, in fact all normal human brains, share one thing. The brain is the only organ capable of studying itself! Now that’s profound!

11) The Simulated Universe! The human species, especially since the proliferation of the computer and associated technologies, have created thousands of simulated landscapes and virtual beings, from the humble Microsoft office assistant to pilot training simulators to video games that cater to all types of interests and age groups. Entire movies are now computer generated simulations – no actual on-location travel required; no humans need apply in hopes of earning an eventual Oscar for best actor. In view of the explosion of simulation technologies, and it’s only going to increase and get ever more realistic than it already is, the question has arisen, if we can create virtual worlds, might not we in turn be virtual beings ‘living’ in a simulated landscape programmed for some purpose or other, by other beings which might be futuristic humans recreating their past history, or ET’s video game version of “The Life and Times on the Third Rock in the Sol Planetary System”. It’s a best seller on Krypton! Though once just sci-fi speculation, that profound idea that we don’t really exist is now taken very seriously indeed.

12) Man Not On the Moon! Humans from Earth landed on the Moon and returned safely to Earth during the period 1969-1972. Three further missions were scrubbed for economic reasons – sort of like buying the car then not driving it because you couldn’t afford gasoline. Since then, economics apparently haven’t improved since we’ve never been back. That we haven’t returned in over 40 years is unprecedented in the history of manned exploration. It’s like if Charles Lindbergh had flown the Atlantic in 1927 and nearly 90 years on there was still no sign of any trans-Atlantic air travel on the horizon. There are currently no plans yet set in concrete for a lunar return mission(s). It’s one of the most shameful and ill-profound examples of human stupidity yet on the public record. There is no logical reason humans shouldn’t have established at least one lunar colony 20 years ago; there’s no logical reason why humans shouldn’t have already landed on Mars.   

Honourable Mention! How is it profoundly possible that the Boston Red Sox (the wild card entry no less) could end up beating the New York Yankees four straight games after being behind three games to zip in the 2004 ALCS? It’s profoundly good if you’re a Boston fan (which I’m not) and profoundly bad if you are a Yankee’s fan (which I am). But no matter which way you slice it, the end result was profound as it was the first time in Major League Baseball playoff history that a team lost the first three games and went on to win the next four to prove victorious in an overall best of seven game series. It’s still a nightmare episode out of “The Twilight Zone” as far as I’m concerned.

Was Time Created?

Is it possible to create time? If you accept the modern cosmological paradigm that’s exactly what happened 13.7 billion years ago. If you accept that, was the creation of time a once only creation or is the creation of time occurring even as you read this? Or, is the whole idea of literally creating time something only those smoking the good stuff could conceive of, while those of a less befuddled mind view as total bovine fertilizer? It’s the latter IMHO, or should be.

According to the standard model of modern cosmology, the Big Bang event 13.7 billion years ago created both space and time. Exactly what the recipe was isn’t given, but there was this act of creation nonetheless. Again, the standard model gives a scenario that even after the Big Bang event, right up to the present time (and presumably beyond our present time) space is still be created (out of nothing) and thus to make room for all this additional space, space itself has to expand (into what isn’t stipulated) and thus we have the popular phrase that we exist in an “expanding universe”.

But if space itself is expanding, then space is a thing, and things cannot be created out of nothing which is what those advocating an expanding space are, well, advocating.

I have elsewhere examined this issue of expanding space and found it to be IMHO utter claptrap. That’s because the concept of expanding space treats space, as noted above, as if space were a thing. Space is not a thing anymore than society, atheism, Wednesday or velocity is a thing; or beauty. Some thing maybe beautiful, but beauty is not a thing.

Now what about time? The alleged creation of time, unlike that of space, seems to have been a one-off happening at that Big Bang event – or is it? Was time, 13.7 billion years ago, created for all time, unlike space, or is the creation of time an ongoing process?

Time only seems to exist up to and including this very moment – right ‘now’. One second from now is in the future and future time does not yet exist. So is time constantly being created in order for there to be a future?  If so, how is it being done, or again, what’s the recipe for creating or cooking up a batch of time? There can’t be a bona fide recipe; otherwise some nerdy geek could create a batch of time at the same time, or within time, which already exists! That concept of creating a bubble of time within existing time should make your head ache!

But relax, there’s no need for the aspirin. There has not been one nanosecond of time created by all the humans who ever were and are (and are likely to be), nor by any of humanity’s machines or devices. No theoretical physicist has ever claimed for example that the Large Hadron Collider could create time, even though it’s supposed to come as close as possible to creating the sort of energies though present at the Big Bang event. Tis a pity actually since many of us feel at times as if there’s not enough time in the day (week, month, or year) to accomplish everything. So wouldn’t it be nice if you could create a bit of extra time on the sly and have a 25 hour day or an eight day week.  Sadly, that’s to be realized only in your dreams (or science fiction books and films).  

The flipside that one second from now is in the future and future time does not yet exist, is what happened to the time that existed just one second ago?  It’s gone. The only record of what happened one second ago rests in your memory or in some recorded device, natural or artificial, all of which only exists or is accessible in the current now. You might remember an event from five years ago, but you remember it ‘now’. A fossil might be evidence of a previous time, but that evidence only exists for your consideration ‘now’. A newsreel film might document an event that happened decades ago, but when you view it you see it ‘now’. When you look at the stars, you see their starlight that was emitted years before, but you see it ‘now’.

It would seem that the only bona fide reality time has is ‘now’. Past time is no longer tangible; future time is yet to be tangible. There’s something very profound about ‘now’ – it’s only in the ‘now’ that things change, and of course change is what gives the concept of time meaning.

But let’s suppose that ‘in the beginning’ time was created ‘in the beginning’. There was a slice of time created at the alpha point – that “now” that gives time ‘reality’ that from the beginning onwards moves forward (in time) until it reaches the omega point. Or, perhaps there was a “now” slice of time created at the alpha point, but that slice stays put while reality moves past it until the omega point is reached. Think of a factory line where there is a row of gizmos (reality) and a worker (time) walks on up the line from gizmo to gizmo and attaches a doohickie to each gizmo in turn from alpha to omega. Or, the worker (time) stands still while a conveyor belt with the gizmos (reality) on it rolls past the worker from alpha to omega while he attaches to each a doohickie in turn.

However, a slice of time is awkward if there’s a different ‘now’ occurrence for different people as viewed by different people. That’s actually a consequence of Einstein’s Special Relativity (see further below).

Why postulate a ‘slice’ of time? Well, as already pointed out, time has no existence in the past and no existence in the future. There’s only that slice of ‘now’ time. How thin is that slice of ‘now’ time? How short is that duration of ‘now’ time? Well there is a concept of the shortest possible interval of time with the caveat that nothing can actually happen in any sense of the term meaningful in any shorter interval of time. Any interval of time can be infinitely subdivided, but there does come a point where nothing of substance can happen if the interval is too short. How short is short? Let’s just say the number of shortest yet meaningful time units that would fit into one traditional second of time vastly, vastly, vastly outnumbers the entire human population past and present. When we say “short”, we really, really, really mean “short”.

But if time were created for the entire duration it would be required for, then that implies some foresight or foreknowledge on the part of the process that created time (or the cook that owns the recipe book). Speaking of the cook, it’s like the cook knowing in advance how big a turkey to buy and prepare for Thanksgiving dinner by knowing in advance how many guests will be present.

If time can be created even if only as a slice of time, then time can cease to be created.

If time were to stop being created, we’d never know since nothing would or could change (which is what time measures – rate of change). We only perceive time because things change from second to second; minute to minute; hour to hour, etc. If time stopped, our hearts would stop in mid-beat, clocks wouldn’t tick, boiling water would stop in mid-boil, and photons on route from the Sun to your eyeball would freeze in mid-space. Presumably if this had ever happened, you’d be none the wiser since that would imply that time was rebooted.

Another fly in the ointment is that while everyone perceives their personal rate of time flow at one second per second (and a second of time by the way is an artificial manmade unit of measurement), not everyone views everyone else’s time flow rate as being one second per second. The flow rate of time, as Einstein pointed out (Special Relativity) is relative. Further, depending on frame of reference, one can see Event A happen before Event B while someone else sees Event B happen before Event A, while a third body sees Event A and Event B happen simultaneously. That’s because it’s the speed of light that’s the physical constant. It does seem odd that in the beginning (assuming a beginning) it wasn’t time or space that was created as being a constant rather it was the speed of light. Actually that makes some sense since both time and space are not things, but light is a thing. However, it’s as if the speed of a batted or thrown baseball was always fixed and the dimensions of the ballpark and the playing field shape-shifted from second to second to accommodate the required outcome!

But adding Special Relativity to the creation of time equation just makes the creation of time recipe super complex. So let’s just drop the idea of time as a thing. Depending on point of view, events happen more or less quickly to others than you think is natural from your frame of reality. You just by force of habit translate that into time units, a habit you need to break. 

When it comes to the concept of time, it is second nature to suppose that no matter what starting or alpha point you presume, a question “what came before that?” is obvious even to blind Freddy. Therefore, it is way easier to adopt the philosophy that there was no alpha point (or omega point) – that time has always existed (and will always exist). Therefore, there was no need for time to be created.

If time wasn’t created, was there ever a first moment when time came to be? That would be the case if (and that’s going to be a mighty bug if): 1) time was an intrinsic property of matter and energy, and 2) if matter and energy were created from scratch. Leaving Point 2 aside for another day, time is not a property of matter and energy*. It’s not difficult to imagine a universe with just one electron in it. As far as that electron is concerned there is no time since there is no change to the state of that universe since there is no change, cannot be any change, to the state of the sole inhabitant of that universe – the one and only electron. Therefore time is not an intrinsic property of matter (and energy).

Finally, you cannot see, hear, taste, touch or smell time, nor can any mechanical instrument. You can say that time can be measured, but what are you actually measuring? What you are measuring are the changing properties of things you (or an instrument) can see, hear, etc. What about a clock? What changes on a clock? Well the minute hand moves from 4 to 5 or on a digital watch the reading changes from 4 to 5. There is a change in the properties of the clock or the watch that you can see or hear. You just label that change in the clock’s properties, time. Your label of time is a concept, a human concept. 

All concepts, like society or beauty, are created, but in the minds of living things, and not just by human beings either since one can imagine non-humans appreciating beauty. No doubt my cats view a full food bowl as something of great beauty! Of course that means in another sense that time has been created, but by humans (and maybe by other animals) for humans. Just like mathematical concepts (more human inventions) help us come to terms with, or help us explain, reality, ditto our artificially constructed concept of time. You certainly don’t hear cosmologists talk about the Big Bang creating concepts like mathematics, society, Wednesday, birthdays, beauty, atheism or velocity. Concepts like these have no tangibility – you can’t weigh them or put them under a microscope.

Conclusion: Time is the most mysterious facet of the cosmos and of your daily life you ever have to come to terms with, though most people don’t bother. But it needn’t be if you stop thinking of time as a thing and view time as a concept, like say your birthday. Unfortunately, way too many cosmologists imply that time is a thing and that the thing we call time was literally created. It’s very easy to say that time was created at the Big Bang event and those hundreds of cosmologists say exactly that. But it’s quite another thing to produce the recipe for how that was accomplished, and on that point these same cosmologists are very strangely silent on the matter. Extraordinary claims (like stating that time was created) require extraordinary evidence – one of those mantras the scientific community love to hurl at those advocating anything they call pseudoscience – but none is given by those very same cosmologists. 

What the Big Bang event did do was set in train all those laws, principles and relationships that govern the cosmos and govern change in the cosmos, which is what our concept of time measures.

So, was time created ‘in the beginning’ – no; ‘once upon a time – that doesn’t work either. No matter how you slice and dice things, the idea that time can be created, like space, is also IMHO utter claptrap. That’s because the concept of creating time treats time as if time were also a thing. Time is no more a thing anymore than space is a thing. But if time itself is being created, then time is a thing, and again things cannot be created out of nothing which is what those advocating the creation of time are, well, advocating.

The easiest way to deal with the concept of time is that that’s exactly what time is – a concept, an abstraction, but not a thing. If time isn’t a thing then time could not be created. If time isn’t a thing, then time travel isn’t possible. You can travel in a thing (i.e. – a car), not in a concept.

*If you consult any science reference book on the fundamental properties of matter and energy, time will not be listed, though things like mass and charge and spin, etc. will be.

The Physics and Philosophy of Time: Part One

“What is time?” That is a question that has been pondered and debated for probably thousands of years by some of the finest philosophical and scientific minds ever produced, without any definitive resolution. So, I’m NOT going to pretend that this is THE ANSWER – the be all and end all to the question. It’s some of my thoughts, which hopefully are as valid as anyone else’s!

What Is Time? It has been said that time is just Nature’s way of preventing everything from happening at once! But the word ‘happening’ is significant because if something happens, something changes. To my way of thinking, time is synonymous with change; time is a measurement of change; change gives the concept of time tangible meaning. If nothing ever changed, if nothing ever happened, it would be meaningless to talk about time. Time is just our informal perception or more formal measurement of rate-of-change. Rates-of-change vary depending on how fast you travel relative to some other frame of reference (the General Theory of Relativity) so the time intervals that measure that rate-of-change vary accordingly. I also can’t help but wonder whether, speaking of things relative, whether one could insist on a constant rate-of-change that’s made constant because your rate-of-time varies, or the more common view from day-to-day experience that rate-of-time is constant but rate-of-change varies.

It’s not difficult to understand why you are not aware of time passing when you sleep. It’s because you’re not aware or cognoscente of anything changing while you’re asleep. In fact, sleep is a way of achieving time travel. You go to sleep at 11 pm. Next thing you know its 7 am and you’ve traveled eight hours into the future seemingly instantly!

Thusly, I conclude that time doesn’t have a separate reality. I mean you can’t weigh time, it has no mass, it has no charge or energy, it isn’t a force and has no particle associated with it, you can’t put time to any physical use, nor can you manipulate time. You certainly can’t bottle and sell it! It’s about as intangible a something as the Universe allows.

Did time exist before there was anyone around to put a label to it? I mean in a pre-life era, change certainly took place – rocks eroded, the tides ebbed and flowed. But was there time? I suggest the answer is ‘no’ in that it takes a certain level of intellect to recognize change or rate-of-change. A rock doesn’t perceive time, nor does the beach upon which the tides act. The changes are physically real enough, but it takes something as complex as a living organism (not of necessity just a human organism) to perceive and understand change, and rate-of-change, which – human beings – for lack of a better word, we call it all happening (i.e. rate-of-change) as a concept called ‘time’.

By analogy, there is the oft quoted puzzle of there being this tree in a forest which falls. Does the falling/fallen tree produce any sound if no one (meaning humans) is around to hear it? (Of course there would be animals like bears, deer, possums, birds, etc. that would hear the sound, but let’s suppose that the forest contains just plants which I assume we can agree on, can’t hear. Now regardless of whether any animals are around or not, the falling tree will produce vibrations in the air (usually air, but vibrations can be equally transmitted in a liquid or solid medium). But vibrating air isn’t by itself sound. Sound is the perception (and possible interpretation) of those vibrations, and that takes a detection device and software (ears and a brain). So, there is no sound without ears and a brain, although the vibrating air is quite real regardless.

Time too, by way of my analogy, is akin to sound; change or rate-of-change is akin to the vibrating air. The former two (time and sound) are perceptions of physical events; the latter two (change and vibrating air) are the real physical events.

You’d think that therefore time wouldn’t exist in a vacuum or at a temperature of absolute zero, as how could anything change in a vacuum which contains nothing or at absolute zero when all motion ceases? Ah, enter the weird and wonderful world of quantum physics and discover that quantum activity, happenings, change, motion, etc. exists even in an apparent perfect vacuum and even at as close to absolute zero as makes no odds. In quantum physics, there’s no possibility of a perfect vacuum; absolute zero is only abstract and can’t ever be actually achieved. Therefore, time always exists as well. There seems to be no way to ever shut down quantum activity and achieving a perfect vacuum and/or absolute zero, so we’re in no danger of ever having our perception of time cease.

The shortest (quantum) unit of time possible is just that interval below which no possible change can happen. In other words, even the quickest ever possible change one can imagine takes an absolute minimum amount of time.

Change also implies there must be causality – there must be a cause that produces an effect, or in other words, something is affected by something else that occurred previously. Going from cause to effect implies a change and a time interval must have taken place into which that change fits. This introduces the commonly used phrase ‘arrow of time’. If time is our perception of change, then what is the ‘arrow of time’? Methinks it’s the reality that on the macro scale at least change happens only in one direction – cause precedes effect; effect follows cause, and that’s change. Examples of such one way cause and effect change include dropping the china cup and it breaks. A broken cup does assemble itself and then leap off the floor into your hand. Humans tend to be conceived, get born, grow up and age. Hair turns gray (or falls out), you get wrinkles and liver spots, and you die. You don’t rise from the grave, re-animate, and age backwards towards childhood and pop back into the womb! A hot cup of coffee cools off to room temperature. A cold cup of coffee doesn’t heat up by itself; even if there’s potential energy enough in the environment (air molecules flying around) to theoretically heat it up.  In other words, you can’t unscramble (or un-boil) an egg. 

Present Time: The Concept of ‘Now’: Does the present actually exist? We speak of it was if it does. But does it? Now I’m sure there’s no debating that there is a past, and that there will be a future. I’m sure there’s no debating that what we’d call five years ago exists in the past; five years on from when you read this is clearly the future. What about five months ago, or ahead?  What about five days or five hours or five seconds? Is half a second ago the past? Is half a second hence the future? Of course it is. In fact, I suggest you can split units of time ever shorter and shorter, but still admit that ‘ago’ means past; hence means future, even if 0.000005 of a second ago really is past, and 0.000005 of a second hence is the future. So where comes the ‘now’ or the present?

While there is a past, and will be a future, there really does exist a present. There apparently is such a thing as the shortest interval of time and nothing shorter can exist in reality. That shortest interval of time is known as Planck-Wheeler time, below which time as we know it ceases to exist. It’s about 10 to the minus 43^rd of a second. That’s how long your present lasts for! One Planck-Wheeler time unit behind you is now forever locked in as part of your unalterable past. One Planck-Wheeler time unit ahead, is still part of your malleable (free will?) future.

Even without resorting to quite such a tiny present, physics logic suggests that you really are an isolated individual that cannot share the present with the rest of the world. Lets imagine this couple, say we call them Clive and Jane, sitting down for their evening meal. Clive says to Jane, “pass the salt please darling”. Now Clive utters that phrase in his present and Jane hears it in her present. But both presents aren’t simultaneous. When Jane hears it in her present, it’s simultaneously Clive’s past because it takes time for sound to travel from voice to ear (and light from mouth to eye). Actually, when Jane hears the word “salt”, “pass the” is already in her past while “please darling” is still in her future. In other words, Clive and Jane can’t ever share the same present even though both pass through identical simultaneously now’s.

Here’s a form of time travel. When Jane looks in a mirror, the image she sees in her present is actually of herself from her past – an ever so slightly younger version of herself because it takes an interval of time for the light to be reflected off Jane, onto the mirror, reflected off that, and back to Jane’s eyes.

In summary, nothing you see or hear has the exact same reality that you perceive in your present because there has been a time lag and things change over time – even incredibly short intervals of time. A common example is looking at a distant star. The star you see in you’re here and now isn’t the same star that exists in that same here and now. You’re looking at a star, which, for all you know, just may no longer exist!

Of course you do live your entire life in the actual ‘now’ – you certainly don’t literally live in any part of your past, nor your future. Your life, your lifetime of ‘now’, is a string of Planck-Wheeler time units.

All Our Yesterdays; All Our Tomorrows

We are all familiar with the concepts of ‘yesterday’ and ‘tomorrow’. We probably use the terms all the time in daily conversation and correspondence. But exactly where do we find ‘yesterday’ or ‘tomorrow’? What exactly is ‘yesterday’ or for that matter ‘tomorrow’? When exactly is ‘yesterday’ or ‘tomorrow’? We use the terms loosely, but pinning them down is elusive.

Actually, to start the ball rolling, the concepts of ‘yesterday’ and ‘tomorrow’ are totally artificial since your today is already someone else’s tomorrow, or someone else’s yesterday, depending on the relative time zones you and that someone else inhabit. Rather, there is a universal ‘now’ (even if it’s noon in one place and midnight 180 global degrees opposite), and at that point defined as ‘now’ there’s what’s past ‘now’ (history) and what’s still ahead of ‘now’ (the future). However, since we are all familiar and comfortable with the terms ‘yesterday’ (history), ‘today’ (now) and ‘tomorrow’ (future), let’s stick with that though they are unnatural time units since they are artificial distinctions or inventions by humans. Other unnatural, artificial, meaningless, manmade time divisions include the second, minute, hour, week, month, decade, century, and related. But there are some natural time divisions: the ever varying day-night cycle and the broad yearly cycle of the seasons are reflected in the natural world, from annual tree rings to the awake-asleep patterns of wildlife. The Lunar cycle is another natural time unit that influences life on Earth but one that has no corresponding manmade equivalent.

Anyway, even though an artificial concept, where does ‘yesterday’ reside? Where are all our yesterdays? Where does ‘tomorrow’ reside? Where are all our tomorrows?

Let’s consider ‘yesterday’ first, but perhaps one needs to start off by distinguishing between a personal ‘yesterday’ and a generic or universal ‘yesterday’, a ‘yesterday’ that contained all things that happened ‘yesterday’ throughout the entire universe.

When it comes to ‘yesterday’, and the day before ‘yesterday’ and the day before that, etc. you could say ‘all our yesterdays’ resides in what someone tells us happened, or what’s recorded in a book or newspaper, or what’s on tape as in a radio show or TV news bulletin. Yet, if you hear that person, read that article, see that TV program that details all things ‘yesterday’, you are hearing, reading, seeing that ‘yesterday’, today, so you are experiencing ‘yesterday’ today. That’s not what we really mean by ‘yesterday’. 

What happened ‘yesterday’, even if you find out something about ‘yesterday’ today, ultimately resides in your mind and in your memory. That’s what makes ‘yesterday’ really real to you. But ‘yesterday’ is even more real if you directly experienced ‘yesterday’s’ happenings ‘yesterday’. Your ‘yesterday’ is your past; your past is contained in your memory.

But where does ‘yesterday’ reside after the oldest person alive who can remember or recall a ‘yesterday’ beyond the recall of any other living person, dies? Then records that detail all our ‘yesterdays’, say an historical museum exhibit, are only experienced afresh today. There’s no way you can deal with a ‘yesterday’ in ancient Egypt in the same way that an ancient Egyptian who lived through that ‘yesterday’ dealt with it.

A universal ‘yesterday’ suggests that not everything that belongs to ‘yesterday’ is known to other people or is written down or otherwise observed or recorded. In fact most of what happened ‘yesterday’ is in total oblivion to all and sundry. 

What if there was absolutely nothing to preserve for posterity an event that happened ‘yesterday’, say a raindrop impacting the middle of the ocean and there’s not even a fish around to see it splash. Or perhaps a meteor impacted the far side of the Moon or several hydrogen atoms fused to create a helium atom in the core of our Sun releasing a photon which has to ‘fight’ it’s way to the surface and escape, but that takes thousands of years, or if inside a faraway star in a faraway galaxy that photon wouldn’t be visible to us (or our descendents) on Planet Earth for maybe millions of years, if ever (since 99.999% of such photons will bypass Earth). Unless there is a cosmic consciousness, that photon will go unobserved and unrecorded, in which case, did the event happen? Does the photon exist? In fact, ‘yesterday’, 99.999% (add at least 100 more 9’s) of events that transpired in the greater Universe went unrecorded and unobserved. So the historical record of ‘yesterday’ is grossly incomplete, unless again you wish to argue that unobserved, even by the humblest of microbes, means it didn’t happen. It’s a variation on the old ‘if a tree falls in the forest and there’s nothing or no one there to observe it, did it make a sound’?

In any event, perhaps this photon event is an example of ‘yesterday’ and ‘tomorrow’ merging – a ‘yesterday-tomorrow’ connection. A photon created ‘yesterday’ (sometime in the past) but not observed until ‘tomorrow’ (sometime in the future) is still just a single timeline event. In fact, ‘yesterday’ and ‘tomorrow’ are always linked because what happened ‘yesterday’ has a direct causality bearing on what will happen ‘tomorrow’. So in one sense ‘yesterday’ resides in ‘tomorrow’, and ‘tomorrow’ will in turn reside in tomorrow’s ‘tomorrow’. On a human level, a dance between the sheets ‘yesterday’ can result in quite another event nine months worth of tomorrows later!

Where does ‘tomorrow’ (the future) reside? Well, as hinted at above, the future resides in what happened ‘yesterday’. That’s the generic or universal future. What of your personal future? Where does that reside? There’s only one place your personal future resides – inside your mind.

You can imagine the Sun rising ‘tomorrow’, but until it actually does happen that event is all in your mind, but of course when it does happen it’s no longer ‘tomorrow’ is it? ‘Tomorrow’ never actually comes around, just morphs into today. But sooner or later all your personal mental ‘tomorrows’ come to an end, at least that’s the accepted wisdom.

Your future ceases when you’re declared brain dead, or does it? Not entirely, for each and every elementary particle (electrons, etc.) that makes up what was you in your past still has a future – another case of the ‘yesterday and tomorrow’ connection – as those bits and pieces have had as many ‘yesterdays’ as there were ‘yesterdays’ and will have as many ‘tomorrows’ as the Universe allows for. Some of those bits and pieces were no doubt once part of a ‘yesterday’ pre-you life (or even non-life) form and will no doubt become a part of a post-you ‘tomorrow’s’ life form (or non-life form), so you were part of someone or something else’s immortality and you in turn will be immortal as bits of you will become incorporated into other pieces of matter and energy, ‘tomorrow’. 

In summary, your personal ‘yesterday’ is just a memory, housed and locked away in your mind. Your personal ‘tomorrows’ are just patterns of thought and probabilities, possibilities, even near certainties, but only near certainties as nothing is ever set absolutely in concrete (death and taxes excepted). What may, or may not have happened unobserved in your non-personally experienced ‘yesterday’ resides in your imagination. What may or may not happen unobserved outside of your personal world ‘tomorrow’ is also within your imagination. So where does your ‘yesterday’ and ‘tomorrow’ reside – in your mind and nowhere else.

Time & Time Travel: Part One

WHAT IS TIME? ‘What is time?’ exactly is a question that has been pondered and debated for probably thousands of years by some of the finest minds ever produced, without any definitive resolution. So, I’m NOT going to pretend that this is THE ANSWER – the be all and end all to the question. It’s my thoughts, which hopefully are as valid as anyone else’s!

It has been said that time is just nature’s way of preventing everything from happening at once! But the word ‘happening’ is significant because if something happens, something changes. To my way of thinking, time is synonymous with change; time is a measurement of change; change gives the concept of time tangible meaning. If nothing ever changed, if nothing ever happened, it would be meaningless to talk about time. Time is just our informal perception or more formal measurement of rate of change. Rates of change vary depending on how fast you travel relative to some other frame of reference (Theory of Relativity) so the time intervals that measure that rate of change vary accordingly. I also can’t help but wonder whether, speaking of things relative, whether one could insist on a constant rate of change that’s made constant because your rate of time varies, or the more common view from day-to-day experience that rate of time is constant but rate of change varies.

It’s not difficult to understand why you are not aware of time passing when you sleep. It’s because you’re not aware or cognoscente of anything changing while you’re asleep. In fact, sleep is a way of achieving time travel. You go to sleep at 11 pm. Next thing you know its 7 am and you’ve traveled eight hours into the future seemingly instantly!

Thusly, I conclude that time doesn’t have a separate reality. I mean you can’t weigh time, it has no mass, it has no charge or energy, it isn’t a force and has no particle associated with it, you can’t put time to any physical use, nor can you manipulate time. You certainly can’t bottle and sell it! It’s about as intangible a something as the Universe allows.

Did time exist before there was anyone around to put a label to it? I mean in a pre-life era, change certainly took place – rocks eroded, the tides ebbed and flowed. But was there time? I suggest the answer is no in that it takes a certain level of intellect to recognize change or rate of change. A rock doesn’t perceive time, nor does the beach upon which the tides act. The changes are physically real enough, but it takes something as complex as a living organism (not of necessity just a human organism) to perceive and understand change, and rate of change, which – human beings – for lack of a better word we call it all happening in a concept called ‘time’.

By analogy, there is the oft quoted puzzle of there being this tree in a forest which falls. Does the falling/fallen tree produce any sound if no one (meaning humans) is around to hear it? (Of course there would be animals (bears, deer, possums, birds, etc.) that would hear the sound, but let’s suppose that the forest contains just plants which I assume we can agree on, can’t hear. Now regardless of whether any animals are around or not, the falling tree will produce vibrations in the air (usually air, but vibrations can be equally transmitted in a liquid or solid medium). But vibrating air isn’t by itself sound. Sound is the perception (and possible interpretation) of those vibrations, and that takes a detection device and software (ears and a brain). So, there is no sound without ears and a brain, although the vibrating air is quite real regardless.

Time, to by way of thinking, is akin to sound; change is akin to the vibrating air. The former two are perceptions of physical events; the latter two are the real physical events.

You’d think that therefore time wouldn’t exist in a vacuum or at a temperature of absolute zero, as how could anything change in a vacuum which contains nothing or at absolute zero when all motion ceases? Ah, enter the weird and wonderful world of quantum physics and discover that quantum activity, happenings, change, motion, etc. exists even in a perfect vacuum and even at absolute zero. Therefore, time exists as well. There seems to be no way to ever shut down quantum activity, so we’re in no danger of ever having our perception of time cease.

The shortest (quantum) unit of time possible is just that interval below which no possible change can happen. In other words, even the quickest ever possible change one can imagine takes an absolute minimum amount of time.

Change also implies there must be causality – there must be a cause that produces an effect, or in other words, something is affected by something else that occurred previously. Going from cause to effect implies a change and a time interval must have taken place into which that change fits. This introduces the commonly used phrase ‘arrow of time’. If time is our perception of change, then what is the ‘arrow of time’? Methinks it’s the reality that on the macro scale at least change happens only in one direction – cause precedes effect; effect follows cause, and that’s change. Examples of such one way cause and effect change include dropping the china cup and it breaks. A broken cup does assemble itself and then leap off the floor into your hand. Humans tend to be conceived, get born, grow up and age. Hair turns gray (or falls out), you get wrinkles and liver spots, and you die. You don’t rise from the grave, re-animate, and age backwards towards childhood and pop back into the womb! A hot cup of coffee cools off to room temperature. A cold cup of coffee doesn’t heat up by itself; even if there’s potential energy enough in the environment (air molecules flying around) to theoretically heat it up.  In other words, you can’t unscramble (or un-boil) an egg. 

Further readings about time:

Lockwood, Michael; The Labyrinth of Time: Introducing the Universe; Oxford University Press, Oxford; 2005:

PRESENT TIME: THE CONCEPT OF ‘NOW’: Does the present actually exist? We speak of it was if it does. But does it? Now I’m sure there’s no debating that there is a past, and that there will be a future. I’m sure there’s no debating that five years ago exists in the past; five years on from when you read this is clearly the future. What about five months ago, or ahead?  What about five days or five hours or five seconds? Is half a second ago the past? Is half a second hence the future? Of course it is. In fact, I suggest you can split units of time ever shorter and shorter, but still admit that ‘ago’ means past; hence means future, even if 0.000005 of a second ago really is past, and 0.000005 of a second hence is the future. So where comes the ‘now’ or the present?

While there is a past, and will be a future, there really does exist a present. There apparently is such a thing as the shortest interval of time and nothing shorter can exist in reality. That shortest interval of time is known as Planck-Wheeler time, below which time as we know it ceases to exist. It’s about 10 to the minus 43^rd of a second. That’s how long your present lasts for! One Planck-Wheeler time unit behind you is now forever locked in as part of your unalterable past. One Planck-Wheeler time unit ahead, is still part of your malleable (free will?) future.

Even without resorting to quite such a tiny present, physics logic suggests that you really are an isolated individual that cannot share the present with the rest of the world. Lets imagine this couple, say we call them Clive and Jane, sitting down for their evening meal. Clive says to Jane, “pass the salt please darling”. Now Clive utters that phrase in his present and Jane hears it in her present. But both presents aren’t simultaneous. When Jane hears it in her present, it’s simultaneously Clive’s past because it takes time for sound to travel from voice to ear (and light from mouth to eye). Actually, when Jane hears the word “salt”, “pass the” is already in her past while “please darling” is still in her future. In other words, Clive and Jane can’t ever share the same present even though both pass through identical simultaneously now’s.

Here’s a form of time travel. When Jane looks in a mirror, the image she sees in her present is actually of herself from her past – an ever so slightly younger version of herself because it takes an interval of time for the light to be reflected off Jane, onto the mirror, reflected off that, and back to Jane’s eyes.

In summary, nothing you see or hear has the exact same reality that you perceive in your present because there has been a time lag and things change over time – even incredibly short intervals of time. A common example is looking at a distant star. The star you see in you’re here and now isn’t the same star that exists in that same here and now. You’re looking at a star, which, for all you know, just may no longer exist!

Of course you do live your entire life in the actual ‘now’ – you certainly don’t literally live in any part of your past nor your future. Your life, your lifetime of ‘now’, is a string of Planck-Wheeler time units.

To be continued…