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The meaningless Big Bang question

Posted under Astronomy

Professor Russell Stannard explores what kind of universe we live in and what caused the Big Bang.

25 Feb
2010

 

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Russell: What kind of world do we live in - what kind of universe? Well, thanks to telescopes well like that one over there, and today especially the Hubble telescope out in space we know a great deal about what’s out there, the structure of the universe, how it came into existence, how it got to be the way it is today. Beginning with planet earth, we know it to be part of the solar system. Our sun is a star much like all the other stars. Stars are gathered together into great swirling whirlpools called galaxies. Our galaxy is called the Milky Way Galaxy. Galaxies in their turn are gathered into clusters of galaxies. And these clusters stretch out into space as far as we can see. And when we observe distant galaxy clusters, we find that they are all receding away from us. The further off a galaxy cluster, the faster it's receding into the distance. And all this seems to point to the idea that at some time in the past all the matter of the universe was gathered together at a point. There was a great explosion - the Big Bang - and everything flew apart. The motion of the galaxies we see today is exactly what we would expect if it had resulted from such an explosion.

 

Not only that, but knowing how fast a galaxy cluster is moving and its distance from us we can work back to when everything must have been together, in other words when the Big Bang occurred. And it turns out that it happened 13.7 billion years ago. Our current thinking about how the Big Bang developed is nothing short of amazing. This is where it all begins. At first there is a brief period of exceedingly rapid expansion. What we call inflation. That then switches off round about here and then we get the normal sort of expansion we see today happening along here. We call that the Hubble expansion. Edwin Hubble was the astronomer who first discovered the universe was expanding. In saying that inflation took place over a brief period, I mean really, really brief! It all happened in the space of a tiny, tiny fraction of a second. That's right. We are talking about what happened a tiny fraction of a second after the instant of the Big Bang. It's a truly mind-blowing achievement. The Big Bang was such a cataclysmic event that we assume it must have marked the point when the universe came into being. In which case it appears natural to ask what caused it, you know what caused the big? And what came before the big bang.

 

But there’s a problem, it’s all very well talking about what happened immediately after the instant of the Big Bang, you know inflation, a tiny fraction of a second. there is all the difference in the world between saying what the universe was like a tiny fraction of a second after the instant of the Big Bang, and what it was like at the instant of the Big Bang - let alone what might have happened before that instant. You see, at that instant, all the matter of the universe would have been squashed down to a point, a place of no volume, so the density would be infinite. And there's no way our physics can handle a situation like that. We call it a singularity. We can't handle it, but at least we can give it a name and we call it a singularity. And that means we have no hope of extending our investigation through that instant to what might have preceded it, to what might have caused the Big Bang.

 

Okay that's one reason why the question 'What caused the Big Bang?' can't be answered. But there might be an even stranger reason. It's currently thought that the Big Bang not only saw the coming into existence of the contents of the universe - everything we see around us, but it also marked the coming into existence of space and of the coming into existence of time. This is all bound up in Einstein's theory of relativity. So, there was no time before the Big Bang. Now, for those seeking a cause of the Big Bang there's a problem here. Cause is followed by effect. I stir the coffee, that’s the cause, and what you see happening there is the effect. First the cause then the effect. The effect here is the Big Bang. So the cause of it must have existed before the Big Bang. But where the Big Bang is concerned, there is no before. So it's not simply a case of us not knowing how to extrapolate through that point of infinite density.

 

No, the problem goes deeper than that. The question: 'What caused the Big Bang?', the question itself probably has no meaning. There is no time to accommodate a cause. So there can't be a cause. St. Augustine was once asked, “What was God doing before he made Heaven and Earth?” Augustine replied, “He was creating Hell for people who ask questions like that.” In fact this is a fairly common problem when exploring science at its deepest levels - when you're right up against the boundaries of the knowable. Are you asking the right question? It might sound a perfectly fair question, you know 'What caused the big bang?' But is it? No. A much better question in this particular instance is this: 'Why is there something rather than nothing?' We're not talking specifically about the mechanism of the Big Bang. No, we're asking the very general question: 'Why does anything exist?' You see, if nothing existed or had ever existed would that call for an explanation? No. Why should anything exist? But as soon as something exists, anything at all, then the questions start. Why does this particular kind of thing exist and not something else? What is responsible for their existence? And once having got something into existence does it need an agency of some kind to sort of keep it in existence? Science does not address questions like that. It takes the world as a given. Its job is to describe the world as it happens to be, without worrying why there should be a world in the first place. Which is not to say that the question 'Why is there something rather than nothing?' can be ignored. It might well be a meaningful question. It simply lies beyond the boundaries of scientific inquiry.

 

After Piece

 

Tony: Was that all right for sound? I thought I heard a door bang during that take.
Russell: Ah but was that a meaningful question Tony? What caused the bang?
Tony: Moving on.

The expanding cosmos all began with the Big Bang 13.7 billion years ago. To discover what caused the Big Bang, we would need to know what preceded it. But that would involve the impossible task of estimating through the initial instant to when the entire universe was squashed down to a point of infinite density. Our physics cannot handle such situations.

And the problem actually goes deeper. The Big Bang saw the coming into existence of not only the contents of the universe, but also of space and time. Without any pre-existing time, there could not have been a cause of the Big Bang.

So it is not a case of us failing to answer the question ‘what caused the Big Bang?’ because the question itself is meaningless.

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Making it a meaningful question

George Dishman

This comment is a reply to a previous related discussion on the Open2.net forum.
Hi Chris,

Had he maintained it he would not have been condemned by the Church. So to speak of "mathematical truth" actually undermines the point you are making, and underlines the point I am making!! 

I have never mentioned "mathematical truth" before and that is a distortion of what I was saying. My point is that measurements are numerical ratios of actual values to a defined unit, hence are as regular as the real numbers. The inaccuracy of actual measurements is a practical limitation, not theoretical.

Yes you did,  implicitly :-

2. Absolute, true, and mathematical time, of itself, and from its own nature ... 

As I said, to say I was speaking of "mathematical truth" is a distortion. I clearly attributed the quote to Newton and he was not talking of "mathematical truth" either. What he said was that in science we should not confuse the true nature of time which exists in its own right and is "equable" or regular as Aristotle said (at least in translation) with practical approximations derived as measurements based on motion which are inevitably subject to random variations and are thus irregular.

On Prof. Stannard's piece,  he also reflects my opinion.  Translating what he says into the terms I have been using,  it is meaningless to speak of a physical or natural "cause" of the Universe (the question is ill-posed),  but the question "why is there something rather than nothing" is well-posed and not necessarily meaningless.  Such a question cannot have a naturalistic answer in principle : any answer must be supernatural.

Not at all, we have already touched on one potential physical answer through the conservation laws. If the net energy is to be zero and gravitational energy is negative, there must be some form of positive energy to maintain the total.

You can also invoke the weak anthropic principle, we could not find ourselves in a universe in which nothing exists as that would include us!

Only if we know on other grounds that the supernatural does not exist can we rule the questiion out as meaningless.

Not at all, if the supernatural does not exist then it merely means any answer must be physical or equally that the question may be well posed but has no answer, it is simply the way the universe is.

..  explained that time iteslf was not "before" the Creation.  "Before" in this context has no meaning.

 
Exactly, which is why precisely the concept of "creation" is inapplicable in that model as we have covered before. For those that weren't reading the old forum, we have also discussed a paper by Alan Guth (who originated the idea of inflation).
 
Time Since the Beginning
 
Section 5 of that paper considers a possible prior "false vacuum" state of continuous inflation within which our universe starts as a quantum event. In that model, there would be a creation event and the question of what happened before the big bang is not only meaningful but is answered.

George
 

Why is there something rather than nothing?

Chris Jeynes

Hi George.  For other readers' convenience,  this discussion is continuing our previous discussion at www.open2.net/forum/showthread.php (post #349).  Let me repeat what I said there in post #347 :-
 
... let me just mention that Aristotle and Augustine had different approaches to time (and lots of other things). They had different presuppositions. Newton plumped for a Platonic idea of time (consistent with the Aristotelian here). But Newton's "Platonism" ("mathematical" time) is completely different philosophically from Aristotle's. The Greeks distinguished between the "physical" (what was real) and the "mathematical" (merely a description of the appearance!). And this is the distinction that Galileo broke down. Had he maintained it he would not have been condemned by the Church. So to speak of "mathematical truth" actually undermines the point you are making, and underlines the point I am making!
 

Newton was talking of "mathematical" truth in a modern way,  for all that he was the "last mediaeval". But he did not have the modern interest in approximations,  which interest has arisen because we have found that there are mathematically intractable problems.  For example,  Newton did not know that the three-body problem was insoluble analytically.  Specifically,  it was only in 1747 that d'Alembert demonstrated that it could be solved by successive approximation.  Even the two-body problem was only solved completely by Euler in 1744.
 
So your distinction between what Newton thought was "true" and what he thought was "practical" is anachronistic. It is also (even more!) anachronistic to think that Augustine thought in the same terms.  No,  Augustine really thought that creatures are necessary to measure time,  where I mean by "measure" what you have said.  And this is precisely how we measure time today.  I still think this is astonishing.  Note that with this definition of time,  the (metaphysical) question of "regularity" is sidestepped.
 
I said,  "Only if we know on other grounds that the supernatural does not exist can we rule out the question ["why is there something rather than nothing?"] as meaningless."  You proceeded to raise the possibility of physical answers to the question of the cause of the Universe.  This is a misunderstanding,  as I have said before.  Finding a physical cause of the Universe cannot answer the question of why is there something rather than nothing,  which question is irreducibly supernatural.  This must be so since a physical cause must itself be either caused or require a non-causal (ie,  supernatural!) explanation,  and this applies to Guth's metaphysical (ie physical,  but speculative) theory too.  If the supernatural does not exist then the question is simply meaningless.  You implicitly acknowledge this when you say,  "if the supernatural does not exist then it merely means ... that the question may be well posed but has no answer, it is simply the way the universe is."  If the question has no answer then it is ill-posed by definition!  This is what it means to say that "it is simply the way the universe is" (which is a valid and coherent position of course).
 

Why is there something rather than nothing?

George Dishman

Hi Chris,
For other readers' convenience,  this discussion is continuing our previous discussion at www.open2.net/forum/showthread.php (post #349).  Let me repeat what I said there in post #347 :-
 
... let me just mention that Aristotle and Augustine had different approaches to time (and lots of other things). They had different presuppositions. Newton plumped for a Platonic idea of time (consistent with the Aristotelian here). But Newton's "Platonism" ("mathematical" time) is completely different philosophically from Aristotle's. The Greeks distinguished between the "physical" (what was real) and the "mathematical" (merely a description of the appearance!). And this is the distinction that Galileo broke down. Had he maintained it he would not have been condemned by the Church. So to speak of "mathematical truth" actually undermines the point you are making, and underlines the point I am making!
 

Newton was talking of "mathematical" truth in a modern way,  ...
 
As I said in my previous reply neither Newton nor I were talking of "mathematical truth" at any point Chris.
 
For everyone's convenience, here is what Newton actually said:
 
1. Hitherto I have laid down the definitions of such words as are less known, and explained the sense in which I would have them to be understood in the following discourse. I do not define time, space, place and motion, as being well known to all. Only I must observe, that the vulgar conceive those quantities under no other notions but from the relation they bear to sensible objects. And thence arise certain prejudices, for the removing of which, it will be convenient to distinguish them into absolute and relative, true and apparent, mathematical and common.

2. Absolute, true, and mathematical time, of itself, and from its own nature flows equably without regard to anything external, and by another name is called duration: relative, apparent, and common time, [which] is some sensible and external (whether accurate or unequable) measure of duration by the means of motion, which is commonly used instead of true time; such as an hour, a day, a month, a year.
 
The above is taken from:
 
http://www.mnstate.edu/gracyk/courses/web%20publishing/NewtonScholium.htm
 
He is making clear that, if the laws which he later develops are to hold, time must be understaaod as fundamentally "equable". Obviously, if an object is drifting through space unaffected by external forces, we know from the First Law that it's speed should be constant. If we measure how far it travels in equal periods, that will be the case but if units of duration were not equal in principle, then the corresponding distances covered would also vary and so apparently would the velocity. For the First Law to hold, both durations and distances must be "equable" or "regular". The laws thus reside in what Penrose calls "Platonic mathematical World", something I think you should already understand Chris.
 
... for all that he was the "last mediaeval". But he did not have the modern interest in approximations,  which interest has arisen because we have found that there are mathematically intractable problems.  For example,  Newton did not know that the three-body problem was insoluble analytically.  Specifically,  it was only in 1747 that d'Alembert demonstrated that it could be solved by successive approximation.  Even the two-body problem was only solved completely by Euler in 1744.
So your distinction between what Newton thought was "true" and what he thought was "practical" is anachronistic.
 
We are not talking of the diffiulty of measurement or whether specific problems have analytic solutions, you are attacking a strawman.
 
It is also (even more!) anachronistic to think that Augustine thought in the same terms.  ...
 
Nor did I ever suggest he did, quite the opposite. What you say subsequently completely misses the point but I'll have to leave addressing that for another day when time pemits.
 
best regards
George

Continuing the "Explosion in Space" misconception

George Dishman

While overall the piece is a reasonable summary at a very basic level, sadly it continues to promote what is probably the biggest misconception about our understanding of the model that is known as the Big Bang. The animation shown around 1:27 into the piece shows an expanding ball of plasma but that is wrong, the model says that the whole of space was filled with plasma and in fact the primary evidence for a period of inflation is the remarkable uniformity of the plasma at that time.
 

Screengrab if the graphic above is not visible.
Perhaps something like the mottled picture we have from WMAP being stretched as the contrast reduces would be more accurate, though less spectacular.
IMHO, it would also have better to include a little more on the timeline and in particular the period between inflation and the surface of last scattering at 378k years from which we see the CMBR includes the period of nucleogenesis between roughly 1 second to 1 minute, but for such a short piece, I accept the majority has to be left out.
 
George
 

Comments on: "The meaningless Big Bang question"

Archive Comments

has started a thread discussing The meaningless Big Bang question.

Why is there something rather than nothing?

Chris Jeynes

An excellent piece.  It is at a basic level,  but that is good since it should be accessible to everyone.
I think that the Abstract ought to have pointed out that while the question "What is the cause of the Universe?" is meaningless,  the related question "Why is there something rather than nothing?" is not!
Just a quibble.  Prof. Stannard (for whom I have the highest regard) did not get Augustine quite right (I am sure he was deliberately simplifying).  Augustine actually says (Confessions X1:12) :-
 
My answer to those who ask 'What was God doing before he made heaven and hell' is not 'He was preparing Hell for people who pry into mysteries'.  This frivolous retort has been made before now,  so we are told,  in order to evade the point of the question.  But it is one thing to make fun of the questioner and another to find the answer.  So I shall refrain from this reply ...
 

This is in the course of a very long discussion of the nature of time,  of which the conclusion is that time is one of God's creatures,  itself made at the beginning.  It seems to me that this is a very modern attitude!

Why is there something rather than nothing?

George Dishman

 
 
Hi CJ,

    I think that the Abstract ought to have pointed out that while the  question "What is the
cause of the Universe?
" is meaningless,  the related question "Why is there something rather
than nothing?
" is not!

I think that is covered more than adequately in the main body, and given that the work is in the Astronomy group rather than a philosophy area, it could be argued that it is disproportionately covered. There is a great deal that could have been said about the GUT era, baryogenesis, nucleogenesis, the freezing out of relative abundances of hydrogen, helium and lithium, the CMBR and its acoustic spectrum, the dark ages, re-ionisation and the formation of galaxies which would be more relevant in this forum IMHO.
George

Why is there something rather than nothing?

Chris Jeynes

Hi George!  Yes of course there is much to be said that had to be omitted,  but the primary question of the piece was on meaninglessness.  Which is inescapably philosophical.  Cosmology more than the other sciences can hardly ignore its philosophical fringe!  IMHO the Abstract should have said something to the effect that the question is ill-posed,  but points to a (different) well-posed question.  And the subject is cosmology (rather than merely astronomy),  and therefore inescapably philosophical.

Why is there something rather than nothing?

George Dishman

Having looked around a bit, they have quite a good timeline here:
 
Universe Timeline
 
although there is a minor typo on the entry for 10^39 years and the front page mentions the "Big Crunch" but that (correctly) doesn't appear in the detailed pages.
 
As for cosmology, one of my favourite books is:
 
"Principles of Physical Cosmology" by Peebles
 
While cosmology in the early to mid 20th century had a significant philosophical content, there was a major push to bring it into hard science when modern telescopes started allowing accurate measurements to be made. Peebles' book is a bit old now but is still very good for showing how the modern models are derived from real measurements to scientific standards.
 
George
 

Why is there something rather than nothing?

Chris Jeynes

Hi George.  Yes,  the timeline is very nice.  What you say about Cosmology is correct.  There is Cosmology (the hard science),  the Cosmogeny (the study of the evolution of the universe,  I think this is synonymous with cosmology) and Cosmogony (the beginnings of the universe).  Since the universe is everything there is (or at least,  everything there is naturally),  it seems to me that the big questions (like,  "Why is there something rather than nothing?") can't be excluded,  and that therefore there is a philosophical fringe to the whole discussion.  Which is of course what we have been engaging in!  But where Cosmogeny is heavily scientific,  Cosmogony is almost exclusively philosophical.

Why is there something rather than nothing?

George Dishman

Good summary Chris. The word "Cosmogeny" seems to be less widely used in public circles but I would take that as more to do with, for example, the means by which galaxies form and their relationship to supermassive black holes whereas cosmology is more to do with the larger scale structure, the overall topology and GR which commonly treats superclusters as "dust" grains. As you say, we are really treating cosmology as a given and were looking at the philosophical consequences.
 
George
 

Archive Comments

I have to contest the Big Bang Theory as a scientific proof or fact.

It even lacks a certain appeal to fitting anything we can observe, or relate to in life.
Not much in our world in the way of construction, comes from any type of big bang.

Except by predetermined demolition designed to make way for new building.

Usually when things are jammed together or blown apart we get no construction. I have seen no proof whatsoever to support this single special case of a "Big Bang" creating a Universe.

I believe that more then likely the Universe was built rather slowly over time. By the formation over time of sustainable sized planets and stars.
Whose volume to surface area limited their size.
As a single cell animals size is limited by cell wall membrane surface area, compared to the cells volume.
A planet and sun are limited in size by similar factors.

I warn that I follow a much older form of science, Universal Science. Universal Science is just starting to get serious looks, as the legitimate source of scientific truths.
For many years it was shunned and attacked. Much like Socrates was attacked for having truth, and suggesting self truth as the only way to solid science. If you cannot be true to yourself, your science will not be true.

My first impression when I heard the term "Big Bang" applied as the explanation for the formation of the universe, was that it was a joke, a prank, someone was playing.

Much to my horror it was put forth as real.

There was much work done showing that the particle of electricity is indestructible. And does not come in contact with other particles of electricity at all.
There was also proof that the particle of electricity was one of an infinite number (uncountable number) of particles of electricity that from a sphere, the single hydrogen nucleus.
The hydrogen nucleus is held in play by exterior forces, and the mathematics of spherical surface area and spherical volume.

Since all like particles repel. All things were actually repelling. The entire universe is under pressure from all sides. By extremely high velocity particles of electricity. Creating the pressure that we see in structures, like rope, and chain, as its strength, or lifting ability. Things like chain and rope appear to have a want not to pull apart.

Even after the fall of Universal Scientists, some college professors did find proof of the cosmic rays in space. Which were confirmed as particles of electricity. They were first contested and denied.

We say metal has an affection for itself or attracts its own atoms to pull together, to form a singe body. However since no one could ever prove a scientific force of attraction. The only explanation was that these materials are under pressure. A force is pushing them together.

At this time many started to understand the amazing abilities that men like Benjamin Franklin, and Tesla had been talking about. Because for the first time they understood matter as an electrical effect. Rather then something solid with real weight.

Rather, men realized that matter had no real mass or weight. Those qualities were nothing more then an electrical effect. That could be controlled or effected.

Many wars have done there evil, to hide these simple truths, from good men that would use this knowledge for good.

I would think that our science close to home needs some cleaning up, before we imagine what happened so many years ago, as fact.

Sincerely,

William McCormick

The Big Bang

George Dishman

I have to contest the Big Bang Theory as a scientific proof or fact.

 
It is neither, it is a model.
 
The facts on which the model is built are observations such as:

  • the observed Hubble Redshift and the "stretch factor" measured in Type Ia supernovae which show that distant galactic clusters are moving away from us at a speed proportional to their distance,
  • the Black Body spectrum of the CMBR which shows it comes from a thin surface, not a diffuse source spread through space,
  • the relative abundances of hydrogen, helium and lithium which match the predicted values and
  • the existence of deuterium in primordial material which cannot be produced by stellar processes.

The theory which provides the maths to do the cosmological calculations is Einstein's General Relativity, an equation which he derived and has been confirmed from observations to be accurate to better than our ability to measure. Obviously there is a lot of other theory involved in predicting the nuclear abundancies produced but see the link I posted elsewhere on this page for an overview of nucleosynthesis. Again, those theories are mathematical equations derived from factual observations which lead to what is called the Standard Model".
 
George

Archive Comments

dear sir,
the big bang theory is only a theory; it is not fact as most professors would have us believe. to believe this theory is like taking a leap of faith and jumping off the forth bridge into the river before you have learned to swim because someone said it could be done successfully.
how about other theories?;
[1]
that the universe as we know it may actually be just a super galaxy which is so far from it's nearest of countless other super -galaxies [ let's say a trillion trillion lt. yrs. away] that we cannot detect these other super-galaxies[universes].
[2]
that our universe may have started from some prime sub-atomic particles interacting in disorganised improbable groups to form the first atoms which interacted with each other or with other sub-atomic particles as catalists to slowly form more and more atoms [probably hydrogen. as more atoms formed the first star could have formed.
this requires all space was filled with sub atomic particlesof which all matter breaks down to in time. this means our universe may have formed from effects such as gamma rays from hyper-novas at the nearest outer edges of our closest neighbouring sg [universe]
3
our universe could be considered to be a cancer or viral infection of an otherwise [perfect?] empty cosmos full of inert sub-atomic particles which cannot be detected.

Alternative models

George Dishman

how about other theories?;
[1]
that the universe as we know it may actually be just a super galaxy which is
so far from it's nearest of countless other super -galaxies [ let's say a trillion
trillion lt. yrs. away] that we cannot detect these other super-galaxies[universes].

 
Our Milky Way galaxy is part of the Virgo Supercluster. There is an excellent map here:
 
Atlas Of The Universe
 
That link shows us, then click the "Zoom out" twice to see the supercluster. Zoom out once more to see the other nearby superclusters then once more to see the whole of the observable universe. Far from being unable to detect what you call "super-galaxies", the universe is full of them and there is every indication that these continue far beyond the limit imposed by the age of the universe and the speed of light.
 
[2]
that our universe may have started from some prime sub-atomic particles
interacting in disorganised improbable groups to form the first atoms which
interacted with each other or with other sub-atomic particles as catalists to
slowly form more and more atoms

 
The sub-atomic particles which form protons and then hydrogen are well known and their properties have been measured. One of the key supports for the Big Bang is that when you calculate what mix of hydrogen and helium should be formed, the values are right on the money. This page by Ned Wright gives a brief overview:
 
Big Bang Nucleosynthesis
 
There are few alternatives to the big bang. The "Steady State" model fails numerous tests and "Quasi-Static Steady State" is just the same as the Big Bang but with a "bounce" at very high denisty replacing the singularity. Trouble is, it assumes a "Big Crunch" in the far future which creates the next bounce to produce a cyclical pattern, and there isn't going to be a crunch as far as we can tell since the expansion of the universe is accelerating.
 
George
 

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Thursday, 25th February 2010

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