Eternal Inflation and it's Philospohical implications

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The discussion centers around the concept of Eternal Inflation as an alternative to pre-Big Bang theories, suggesting that inflation can reproduce itself indefinitely without a definitive beginning. This model posits that each "bubble universe" emerges from a pre-existing space-time, leading to a potentially eternal universe. However, the expansion of pre-existing space raises questions about the universe's finite size and the implications of an infinite volume of space, which some find philosophically unsettling. The conversation also touches on the similarities between Eternal Inflation and the steady state universe, as well as the challenges posed by concepts of infinity in cosmology and philosophy. The debate highlights the paradoxes associated with infinity, its implications for understanding the universe, and the difficulties in reconciling these ideas with established scientific theories. The discussion concludes with reflections on the nature of infinity, its contradictions, and the philosophical implications of an eternal universe versus a finite one.
  • #51
My little sister has a better attitude than you're displaying right now. When I explode on you, then you'll have an excuse to post such toddlerish tantrums.

Your little sister no doubt can get your momma to spank you when you tease her endlessly.

I'm presenting an argument and your dodging it, by saying "smart people have argued it, so it must be undecided".

I'm dodging it saying point blank as I have many times that you would argue pigs have wings. That you keep insisting the existence of infinity is a fact without the slightest bit of evidence to prove it. Without so much as a single link and with constant demands that I disprove one endless argument you present after another. Get a life dude. Arguing endlessly does not prove your ideas any more than shouting does.

Yes, that's a good point-the numberline only has 2 directions so it is only "infinite" in those directions- its width is supposedly finite.

This is just one of his standard arguments. It no more proves infinity isn't irrational than saying that both pigs and wings are real, therefore pigs must have wings. Nor does it disprove my assertion that infinity is a self-contradictory and self-referential paradox, which he usually counters with semantic garbage that denies the very mathematical and dictionary definition of the word infinity.

Wuli, please let's be civil. Please stop calling me a liar.

Just stop lying, stop demanding I prove Santa doesn't exist, stop all your usual misdirection and obfuscation and I'll stop calling you a liar. In other words, be civil yourself. Stop pretending you avoid me and avoid discussions like this. Stop pretending you are polite when you are being as obnoxious as can be.

I disagree with this attitude strongly but I can't change what you think of yourself and your own standards of credibility.

Then stop trying dude. Stop demanding I prove Santa isn't real.

Also, just because philosphers have debated something in the past doesn't instantly give the idea credibility. Philosphers have debated many things in the past that we know to be nonsense today. It would help your credibility tremendously if you can find some recent sources to help those that don't have the facts like you seem to.

I'm not interesting in what you think about my credibility. You are the one who keeps insisting I prove people are wrong rather than that they prove they are right. Get a grip, find some genuine sincerity dude and stop with all this obfuscation. Start insisting people prove they are right when someone challanges such statements rather than insisting everyone else prove them wrong.
 
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  • #52
Originally posted by wuliheron
I'm not interesting in what you think about my credibility. You are the one who keeps insisting I prove people are wrong rather than that they prove they are right. Get a grip, find some genuine sincerity dude and stop with all this obfuscation. Start insisting people prove they are right when someone challanges such statements rather than insisting everyone else prove them wrong.

I'm not talking about what I think about your credibility. I'm talking about what all the other people you are calling unscholarly think. You know, the ones who say infinity is a number. And I am very confident that most reasonable people who read this will make their own judgement as well. Like I said. I cannot change your standard of credibility with regard to all these other people.

Also, the burden of proof rules that you keep referring to have no place in this situation. The proof or non-proof of Santa , God, or pink ferries is where this rule DOES apply. None of these things can be proven to not exists and no one has ever proven that they do. Unlike the idea that "infinity" is or is not considered a number by current mathmeticians. This should be easily verified if it's true. You cannot just jump into a posts and make wild claims and then claim that you don't have to show some proof by providing a specific source.

Just stop lying, stop demanding I prove Santa doesn't exist, stop all your usual misdirection and obfuscation and I'll stop calling you a liar. In other words, be civil yourself. Stop pretending you are polite when you are being as obnoxious as can be.
Stop pretending you avoid me and avoid discussions like this.
LOl once again you turn your own crimes on the person you are in a discussion with. And I most certainly do avoid those Paradox threads like the plague. I even try to skip over your posts in non-paradox threads because I find them rarely relevant. But this is not a paradox thread and you have managed to get it off track. The first thing I did was suggest that we get it back on track. That was my only intent. I'm am now making that suggestion again.
 
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  • #53
I'm not talking about what I think about your credibility. I'm talking about what all the other people you are calling unscholarly think.

Not willing to let other people speak for themselves, small wonder.

You cannot just jump into a posts and make wild claims and then claim that you don't have to show some proof by providing a specific source.

Tell us oh great one, what else can we not do?

this is not a paradox thread and you have managed to get it off track. The first thing I did was suggest that we get it back on track. That was my only intent. I'm am now making that suggestion again.

I am trying to keep it on track. Claims that infinity is a number are utter bunk. If you want to keep this thread on track, stop talking for other people and telling me what to do. If you haven't noticed it is you who have totally derailed this thread with all this arguing.
 
  • #54
Originally posted by wuliheron
Not willing to let other people speak for themselves, small wonder.
Tell us oh great one, what else can we not do?
I am trying to keep it on track. Claims that infinity is a number are utter bunk. If you want to keep this thread on track, stop talking for other people and telling me what to do. If you haven't noticed it is you who have totally derailed this thread with all this arguing.

Wow. Man you have some issues.

OK, enough wasting my time with this egomaniac.

Heusdens, where are you? Did the thread come to a natural end with the participation of Eh and Mentat? It seems you are very much against the idea of a finite space/time whereas Eh thinks it's no uglier then theories of infinity.

I love that this discussion has been coming up more often lately. Carry on.
 
  • #55
Originally posted by wuliheron
Your little sister no doubt can get your momma to spank you when you tease her endlessly.



I'm dodging it saying point blank as I have many times that you would argue pigs have wings. That you keep insisting the existence of infinity is a fact without the slightest bit of evidence to prove it. Without so much as a single link and with constant demands that I disprove one endless argument you present after another. Get a life dude. Arguing endlessly does not prove your ideas any more than shouting does.



This is just one of his standard arguments. It no more proves infinity isn't irrational than saying that both pigs and wings are real, therefore pigs must have wings. Nor does it disprove my assertion that infinity is a self-contradictory and self-referential paradox, which he usually counters with semantic garbage that denies the very mathematical and dictionary definition of the word infinity.



Just stop lying, stop demanding I prove Santa doesn't exist, stop all your usual misdirection and obfuscation and I'll stop calling you a liar. In other words, be civil yourself. Stop pretending you avoid me and avoid discussions like this. Stop pretending you are polite when you are being as obnoxious as can be.



Then stop trying dude. Stop demanding I prove Santa isn't real.



I'm not interesting in what you think about my credibility. You are the one who keeps insisting I prove people are wrong rather than that they prove they are right. Get a grip, find some genuine sincerity dude and stop with all this obfuscation. Start insisting people prove they are right when someone challanges such statements rather than insisting everyone else prove them wrong.

Grow up, wuliheron. As you, yourself, have repeated over and over again, this is a forum devoted to scholarly discussion, your last few posts don't even meet the criteria of civilised conversation.

Yes, if I wanted to, I could argue that pigs have wings. I take your saying that as a compliment.

For the 100th time, I am not tring to say that infinity is not paradoxical/self-contradictory/inexplicable/undefinable/etc. I'm really not. I am only trying to show you that the limitlessness paradox, does not apply to infinity. That is all that I am saying.
 
  • #56
Originally posted by Fliption
Wow. Man you have some issues.

Did you just realize that? :wink:

OK, enough wasting my time with this egomaniac.

I agree.

Heusdens, where are you? Did the thread come to a natural end with the participation of Eh and Mentat? It seems you are very much against the idea of a finite space/time whereas Eh thinks it's no uglier then theories of infinity.

Alright then, back on-topic, I should clarify that I am not saying that the universe cannot be infinite. I am saying that I don't believe it can both be infinite, and be expanding at the same time. Eh seems to disagree. I'd like to understand why, but I can't, so I invite Eh to explain his side again.
 
  • #57
Wow. Man you have some issues.

--------------------------------------------------------------------

Did you just realize that?

LOL, you both about as objective and unbiased on the issue of infinity as a Born Again Christian is about God.

Still no proof infinity is a number, nothing but personal slams and innuendo. Perhaps the Heraldo show is more your speed (LOLOLOLOL).
 
  • #58
Originally posted by Fliption
Heusdens, where are you? Did the thread come to a natural end with the participation of Eh and Mentat? It seems you are very much against the idea of a finite space/time whereas Eh thinks it's no uglier then theories of infinity.

I love that this discussion has been coming up more often lately. Carry on.

I have been focusing on here on other issues.

It seemed that my initial thread only lead to the issue of the absurdity of infinity, and not as much about the eternal inflation hypothese. Perhaps we should return back to that theme.

But about infinity...

As a matter of fact I don't think that space/time can be finite.
Although, neither do I think that space/time is infinite in a trivial way (just extending the past to infinity, and extening the observed space to infinity). It happens to be, the universe can not have been this way throughout all of eternity, for several reasons.

Some of this can be explained by Olbers' paradox of the dark night sky. If stars had evolved and were spread around in more or less the same way as they do now, and if space and time were infinite, Olber's paradox proofs that the night sky should be luminous like daytime, because in any direction one would look, we would come across the surface of a star. Naturally, the farther we look, the less brighter and less light we receive, but the more distantiated sphere contains more stars, the two effecst which exactly counterbalance each other (under the conditions that the distribution of lumnious matter is the same throughout all of space and time).
The acceptance of Olbers' paradox leads to the contradiction that either one or both assumptions (space is infinite, time is infinite) are wrong.

A deeper exploration in fact proofs that the night sky IS luminous, and the first calculations of the CMBR showed that this effect of stars from any direction throughout an infine space which was occupied by lumnious matter in the same distribution as we witness now, would lead to a brilliant sky, only not in visible light but as 3K radition.

Current explorations of the CMBR however proof that the spectrum and the fluctuations of the CMBR can not be the effect of star light, and the BB theory provided a better explenation for the CMBR.

Another proof that the universe could not have existed in all of infinity with infinite space, is that the force of gravity would in most cases (dependend on the matter distribution through infinite space) lead to a universe which could not be stable through all of eternity, and thus lead to 'Big Bangs' or 'Big Crunches'.

As a mind experiment, I suggested imagining a universe consisting of only atoms of hydrogen, and assume at some distinct moment a totally perfect distribution of hydrogen atoms throughout all of space. Place an imaginary grid through 3D infinite space (which creates 'cubes' throughout all of space) and place at every corner of a cube (at every crossing of grid lines) one atom of hydrogen, and see how this would evolve through time. Although at first instance this looks like a stable situation (all forces on every hydrogen atom exactly cancel out to zero), but in reality, such can not be the case. All matter would clutter together, only not to a specific point in space, but everywhere. Small inbalances (cause this 'perfect' initial condition, is of course not a situation that is real) would lead to local cluterings, which enlarge themselves.

I am not too familiar with cosmological models, but I have accepted the conclusion of experts, which say that a more or less 'static' universe is impossible.
 
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  • #59
Originally posted by wuliheron

Still no proof infinity is a number, nothing but personal slams and innuendo. Perhaps the Heraldo show is more your speed (LOLOLOLOL). ]

Wuli, please go back to your paradox threads. It is obvious you aren't reading what others are writing. I have said several times that I have no opinion on whether infinity is a number. Yet you insist on this same low effort response above. My only point has been that infinity is useful as a concept in mathematics and cosmology, whether it's a number or not. Please move on.
 
  • #60
Wuli, please go back to your paradox threads. It is obvious you aren't reading what others are writing. I have said several times that I have no opinion on whether infinity is a number. Yet you insist on this same low effort response above. My only point has been that infinity is useful as a concept in mathematics and cosmology, whether it's a number or not. Please move on.

Utter trash once again. You have repeatedly demanded I disprove heusdens' assertion that infinity is a number. If you could care less, why are you so persistent in your demands? If all you care about is discussing the usefulness of infinity, why all the personal insults? If heusdens is so sure of his assertion or so humble, why hasn't he addressed my challange for him to prove his assertion and, in fact, blatently ignored my challange?

Likewise, why should I allow you to insult me and just move on with more such utter garbage? I don't demand that people prove everything they believe, but when they start claiming scientific validity, objectivity, and evidence for such BS I will challange them. Outrageous claims demand outrageous evidence, and outrageous insults demand explanation.
 
  • #61
Originally posted by wuliheron
Utter trash once again. You have repeatedly demanded I disprove heusdens' assertion that infinity is a number. If you could care less, why are you so persistent in your demands? If all you care about is discussing the usefulness of infinity, why all the personal insults? If heusdens is so sure of his assertion or so humble, why hasn't he addressed my challange for him to prove his assertion and, in fact, blatently ignored my challange?

Likewise, why should I allow you to insult me and just move on with more such utter garbage? I don't demand that people prove everything they believe, but when they start claiming scientific validity, objectivity, and evidence for such BS I will challange them. Outrageous claims demand outrageous evidence, and outrageous insults demand explanation.

I am not certain of the topic of wether or not infinity is a number or not, is important, I hold it is a matter of definition.

If we define 'number' to be a distinguisable number on the number line (which reach out in both directions to infinity) it can be stated that there is no such number ( a distinct point on the number line) that corresponds to infinity.

The proof of this is that infinity refers to the fact that such a number would be larger (farther away from an arbitrary point on the number line, which we call 0) then any other number (point on the number line). All points on the number line however share the same property that to the left and to the right, there are infinitely many points.

But that is just the contradiction we come across, that is part of the concept of infinity.

I think however that for linguistic reasons, it is perfectly ok to call infinity a number, although from the way infinity is defined, it has special characteristics that distinguish it from any other number (point on the number line).
 
  • #62
I am not certain of the topic of wether or not infinity is a number or not, is important, I hold it is a matter of definition.

It most certainly is not part of the definition of infinity, just look it up. This is not a trivial distinction either. Declaring infinity to be a bona fide number is to give it a validity is simply does not possesses in academic circles, no matter how convoluted your personal reasoning might be.

Speaking of which, you have not bothered to intervene in this dispute and clarify the matter until it threatened to stop this thread altogether. Likewise, when it did threaten to end this thread, I noticed you spammed the bulletin board with countless verbose cut and paste articles related to the philosophy of infinity.

Again, put up or shut up. I don't want to hear your personal views on the issue. Provide proof or acknowledge that it does not exist.
 
  • #63
Originally posted by wuliheron
Utter trash once again. You have repeatedly demanded I disprove heusdens' assertion that infinity is a number.

Please provide the quote where I have done this "repeatedly". My only point is that just because you can make a semantic statement like "infinity is not a number" doesn't mean that you can totally throw away the usefulness of the infinity concept in a cosmology discussion such as this one. If you go back and re-read, I think it may be clear this is all I was doing. If something I've said is misleading, then I apologize. But please provide the quote where I did this so I can analyze my use of words and possibly improve.

If you could care less, why are you so persistent in your demands? If all you care about is discussing the usefulness of infinity, why all the personal insults?
Anything that I have done that can be interpreted as an insult can clearly be linked to being insulted first. Like being called a liar when I have said over and over that I don't have an opinion on the very topic you were trying to call me a liar about.

If heusdens is so sure of his assertion or so humble, why hasn't he addressed my challange for him to prove his assertion and, in fact, blatently ignored my challange?
I cannot speak for him. I actually understand your point about infinity not being a number. I just diagree that it is important enough to derail the usefulness of the word in a discussion about cosmology theories.

I want to finish in PM, Wuli. Please check yours.
 
  • #64
I cannot speak for him. I actually understand your point about infinity not being a number. I just diagree that it is important enough to derail the usefulness of the word in a discussion about cosmology theories.

As I have asserted all along, my intention is to make sure this bulletin board remains on a scholarly philosophical level instead of degrading into meaningless mumbo jumbo and mystical nonsense parading as scientific fact. Physics forums already has both a religion and mysticism bulletin board not to mention a general discussion one. This one is for scholarly discussion of philosophy.

Expressions of mysticism and what not are great, I'm a mystic myself. But falsely asserting things are established scientific fact, especially about subjects as slippery as infinity, are definite no-nos. In the case of infinity this is especially critical because so many religious beliefs revolve around the issue and it is therefore often contentious.

Because my own interest lies in paradox, the absurd, and the irrational some people take umbrage at what I claim is irrational. Some have even argued with me that nothing is paradoxical, absurd, or irrational (which I both agree with and disagree with of course.) Absurdity is absurd, that is, all over the map.

One does the best they can. :0)
 
  • #65
Back to the topic of an infinite universe that expands. As I've said before, expansion is a local phenomena. As flat space between galaxies expands, the overall size of the universe does not increase. That comes from the very nature of infinity, where every region of space is infinitely small compared to the rest. Even if that region expands, it STILL remains an infinitesimal point in space. So an expanding universe does not get bigger in this situation.

heusdens brought up Olber's paradox. That the night sky is dark disproves the notion of an infinite universe that has existed forever. Actually, the notion of an infinite universe under the physics of 150 years ago was disproven. Modern cosmology has one weapon the scientists back then didn't - the expanding universe. While the fact the universe is only 15 billion years old alone would be enough to handle part of the paradox, the expanding universe does more so.

In the case of a chaotic inflation universe, the same should apply. The finite speed of light and the fact the universe is expanding means light will never be able to reach some regions of the universe. Hence, most of an inflationary universe would be a cold, dark place.
 
  • #66
Originally posted by wuliheron
It most certainly is not part of the definition of infinity, just look it up.


The issue of definition is about the concept of "number" not that of "infinity".

As a matter of speak, using the term "infinite number" means that the concept of number includes infinite numbers too.
 
  • #67
As a matter of speak, using the term "infinite number" means that the concept of number includes infinite numbers too.

Sorry, it doesn't work that way and no amount of fudging semantics will ever make infinity a number. Saying that a number is infinite is not the same thing as saying infinity is a number. Otherwise I could say that cow is black, therefore all cows are black, which is udder nonsense.
 
  • #68
Originally posted by wuliheron
Sorry, it doesn't work that way and no amount of fudging semantics will ever make infinity a number. Saying that a number is infinite is not the same thing as saying infinity is a number. Otherwise I could say that cow is black, therefore all cows are black, which is udder nonsense.

Just hold it. You are mixing things up. I never claimed infinity to be a number.

I said the issue if wether or not the number concept allows for infinite numbers too, and I stated that that is the case.

When we are talking about infinity, don't mix it up with numbers, cause clearly the concept of "infinity" is not the same as the concept of "number".

The concept of number declares it to be having a certain value, and potentially an infinite value.
 
  • #69
Originally posted by Eh
Back to the topic of an infinite universe that expands. As I've said before, expansion is a local phenomena. As flat space between galaxies expands, the overall size of the universe does not increase. That comes from the very nature of infinity, where every region of space is infinitely small compared to the rest. Even if that region expands, it STILL remains an infinitesimal point in space. So an expanding universe does not get bigger in this situation.

heusdens brought up Olber's paradox. That the night sky is dark disproves the notion of an infinite universe that has existed forever. Actually, the notion of an infinite universe under the physics of 150 years ago was disproven. Modern cosmology has one weapon the scientists back then didn't - the expanding universe. While the fact the universe is only 15 billion years old alone would be enough to handle part of the paradox, the expanding universe does more so.

In the case of a chaotic inflation universe, the same should apply. The finite speed of light and the fact the universe is expanding means light will never be able to reach some regions of the universe. Hence, most of an inflationary universe would be a cold, dark place.

Yes, thanks for this addition. As I said, the universe is or can be infinite (must be infinite, in my mind), but is not infinite in a trivial way. The space expansion removes the triviality, and the acompanying paradoxes that result from a trivial infinite universe.
 
  • #70
Just hold it. You are mixing things up. I never claimed infinity to be a number.

Apparently we have another brazen liar in our midst, either that or you have no clue what you have said and don't mind inserting foot into mouth. This is what you wrote:

Infinity is not a finite number, but infinity is a number, but which has peculiar properties, that distinguish it from any finite number.
 
  • #71
Originally posted by wuliheron
Apparently we have another brazen liar in our midst, either that or you have no clue what you have said and don't mind inserting foot into mouth. This is what you wrote:

Well then excuse me!

I hold it my previous post explained it clearly, it must have been a slip of the typewriter to say that infinity is a number.

All cleared up now?
 
  • #72
Well then excuse me!

I hold it my previous post explained it clearly, it must have been a slip of the typewriter to say that infinity is a number.

All cleared up now?

There now, that wasn't difficult, was it.

For just a slip of the typewritter you sure dragged your feet on that one which is just basic mathematical theory.

Ancient Chinese saying,

Don't listen to what people say, watch what they do.
 
  • #73
Originally posted by wuliheron
There now, that wasn't difficult, was it.

For just a slip of the typewritter you sure dragged your feet on that one which is just basic mathematical theory.

Ok. Now, can we go back to the topic?
 
  • #74
Ok. Now, can we go back to the topic?

You've always had the power to go back to Kansas Dorathy. Just click your heals together three times and say, "I want to go home..."
 
  • #75
Originally posted by wuliheron
Utter trash once again. You have repeatedly demanded I disprove heusdens' assertion that infinity is a number. If you could care less, why are you so persistent in your demands? If all you care about is discussing the usefulness of infinity, why all the personal insults? If heusdens is so sure of his assertion or so humble, why hasn't he addressed my challange for him to prove his assertion and, in fact, blatently ignored my challange?

Likewise, why should I allow you to insult me and just move on with more such utter garbage? I don't demand that people prove everything they believe, but when they start claiming scientific validity, objectivity, and evidence for such BS I will challange them. Outrageous claims demand outrageous evidence, and outrageous insults demand explanation.

Do not whine about personal remarks. You started them. You kept using your - now-famous - sarcasm and insults, which destroy any rational conversation. It is human nature that we "bite back" a little.

Fliption is right - put discussions of the rational/irrational nature of infinity in threads devoted to that type of discussion.
 
  • #76
Originally posted by wuliheron
You've always had the power to go back to Kansas Dorathy. Just click your heals together three times and say, "I want to go home..."

... said the tornado that carries all topics off to the land of "wuliheronish" unreasonability. No offense, but it was you who side-tracked the topic.
 
  • #77
... said the tornado that carries all topics off to the land of "wuliheronish" unreasonability. No offense, but it was you who side-tracked the topic.

Infinity IS the topic. All I did was insist infinity is not a number and challange anyone to prove me wrong. No one did prove me wrong, but they did insist on insulting me. You'd better talk to them about changing the subject.

As usual, "Me thinks he doth protest too much."
 
  • #78
Originally posted by wuliheron
Infinity IS the topic. All I did was insist infinity is not a number and challange anyone to prove me wrong. No one did prove me wrong, but they did insist on insulting me. You'd better talk to them about changing the subject.

As usual, "Me thinks he doth protest too much."

Eternal inflation and it's philosophical implications is the topic, and infinity is just a sub-topic.
 
  • #79
Do not whine about personal remarks. You started them. You kept using your - now-famous - sarcasm and insults, which destroy any rational conversation. It is human nature that we "bite back" a little.

Fliption is right - put discussions of the rational/irrational nature of infinity in threads devoted to that type of discussion.

Ya'll have dogged my own posts about paradox forever and now you want special treatment in return. You want to be free to discuss infinity as if it were an established scientific fact and present whatever misleading interpretations of the subject you want as accepted philosophical dogma, read my lips:

Fat Chance!
 
  • #80
Eternal inflation and it's philosophical implications is the topic, and infinity is just a sub-topic.

That's true, better get your facts straight from the ground up and tell other people to please stop talking for you if you want to get back to topic faster. Just click those little heals together Dorathy... that or go back to Oz.
 
  • #82
A lecture of Andrei Linde (Stanford University) on http://pauli.physics.lsa.umich.edu/w/arch/som/sto2001/Linde/real/n001.htm"
 
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  • #83
Infinity is unavoidable, unless one wants to introduce some "outside" cause to the universe. For a lengthy discussion on this, read this thread.

All that says to me is that paradox is unavoidable according to our current view of the universe. Duh! People have known that since prehistoric times and Zeno of Elias pointed that out using logic 2,500 years ago without being so verbose and obtuse.
 
  • #84
Originally posted by wuliheron
Infinity IS the topic. All I did was insist infinity is not a number and challange anyone to prove me wrong. No one did prove me wrong, but they did insist on insulting me. You'd better talk to them about changing the subject.

As usual, "Me thinks he doth protest too much."

Challenge people to prove that infinity is not a number, on another thread. This one is about the philosophical implications of eternal inflation.
 
  • #85
Originally posted by heusdens
Infinity is unavoidable, unless one wants to introduce some "outside" cause to the universe. For a lengthy discussion on this, read https://www.physicsforums.com/showthread.php?s=&threadid=958"

But hey, the no boundary proposal avoids infinity completely. Both time and space are finite. Quantum gravity pending, the other kind of infinity associated with space and time may be avoided, so long as they are both discrete. Such a model is compatible with inflation models.

On a similar topic, here is a link that you might find interesting: http://arxiv.org/abs/astro-ph/9712344

From the URL: "...an inflationary universe gives rise to baby universes, one of which turns out to be itself. Interestingly, the laws of physics may allow the Universe to be its own mother."
 
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  • #86
Challenge people to prove that infinity is not a number, on another thread. This one is about the philosophical implications of eternal inflation.

Duh!

I will challange such nonsense in the name of mathematics any time I please. As I already said Dorathy, if you want to stay in OZ that is your affair. This is a physics philosophy bulletin board, not the land of Oz where anything is possible. One of the philosophical implications of an eternal inflationary universe is that it is paradoxical and infinity not being a number is one of the reasons why.
 
  • #87
Originally posted by Eh
But hey, the no boundary proposal avoids infinity completely. Both time and space are finite. Quantum gravity pending, the other kind of infinity associated with space and time may be avoided, so long as they are both discrete. Such a model is compatible with inflation models.

Space perhaps, not time.
The finiteness of space has not been proven however.


On a similar topic, here is a link that you might find interesting: http://arxiv.org/abs/astro-ph/9712344

From the URL: "...an inflationary universe gives rise to baby universes, one of which turns out to be itself. Interestingly, the laws of physics may allow the Universe to be its own mother."

Oh, well. It might explain why I have a constant feeling of deja-vu.
 
  • #88
With the no boundary proposal, time acts literally like another spatial dimension. Hence past present and future exist as one 4 dimensional unchanging universe.

Unfortunately, I don't see how this could ever be tested, and the best we can hope for is proof about the size of space, not time.
 
  • #89
Originally posted by Eh
With the no boundary proposal, time acts literally like another spatial dimension. Hence past present and future exist as one 4 dimensional unchanging universe.

Unfortunately, I don't see how this could ever be tested, and the best we can hope for is proof about the size of space, not time.

I know this is a propoasal (like the no-boundary proposal) from Stephen Hawking, which also introduces the imaginary time concept.
It was a way of solving the singuality at the big bang.

But not everyone is agreeing on this proposal.
I think the theory of eternal inflation, which makes verifyable predictions of the observable universe and which fixes some of the problems in current Big bang theory, had more merits to go for.
Also it does not require the universe to have a beginning.
 
  • #90
It's only a proposal, but indeed avoids the problems of infinity. While inflation may make some predictions, it is not incompatible with the no boundary proposal. They both work.

But I'm not sure eternal inflation makes many predictions to stand out against the countless other inflation models. But I guess one prediction for an eternal inflationary universe is that space must be infinite. If WMAP finds conclusive evidence the universe is finite, that model will be dead. So in that sense, an infinitely old universe could be falsified within the year. Time will tell.
 
  • #91
Originally posted by Eh
It's only a proposal, but indeed avoids the problems of infinity. While inflation may make some predictions, it is not incompatible with the no boundary proposal. They both work.

But I'm not sure eternal inflation makes many predictions to stand out against the countless other inflation models. But I guess one prediction for an eternal inflationary universe is that space must be infinite. If WMAP finds conclusive evidence the universe is finite, that model will be dead. So in that sense, an infinitely old universe could be falsified within the year. Time will tell.

I would not know. I guess that in eternal inflation, time and space are infinite, but the spacetime bubble that comes out of a certain inflating region, is finite in size.
We can only know about the size of our own spacetime bubble.
 
  • #92
The problem lies in the fact of the hyperbolic shape. A 3 dimensional hyperbolic closed space simply cannot be embeded by 3D space. You would need at least 4 spatial dimensions in order for there to be more universe outside our visible space-time. I don't know what changes would be required to work with an extra dimensional inflation model.
 
  • #93
Originally posted by wuliheron
One of the philosophical implications of an eternal inflationary universe is that it is paradoxical and infinity not being a number is one of the reasons why.
You're just semi-correct. An eternal inflationary-universe is not logically possible. There's no paradox about it (since it's not a mystery).
... If anything has been inflating for eternity, and there is still space outside of itself in order to maintain the inflation, then that thing has to be a finite entity. Therefore, its inflationary-time is definitely finite.
A finite object cannot inflate for an eternity - it needs an origin of time for the process to begin. And an infinite object has no rational meaning (therefore, as it does not exist, it cannot inflate).
 
  • #94
You're just semi-correct. An eternal inflationary-universe is not logically possible. There's no paradox about it (since it's not a mystery).

Au Contre, it is infinitely mysteries. For example, because it has no beginning or end, for all I know every instant is somehow both a beginning and an end. Because it has no limit, for all I know eternity itself is also somehow finite. Logically and conceptually it makes no sense in these respects and is as magical an event as I can conceive of. No different from conceiving of the universe just suddenly appearing out of nowhere and nothing. Both inspire awe and it is perhaps this emotional connection above all that is our most accurate way of conceiving eternity.
 
  • #95
Originally posted by wuliheron
Au Contre, it is infinitely mysteries. For example, because it has no beginning or end, for all I know every instant is somehow both a beginning and an end.
I was trying to explain why an eternal inflationary-universe was not a viable possibility. I.e.; I was trying to show why time/change/motion has a beginning.
Because it has no limit, for all I know eternity itself is also somehow finite.
It is impossible that a finite entity should have no limits to its physical parameters of existence. That would make it an infinite physical-entity.
Logically and conceptually it makes no sense in these respects
If we are to apply reason to physical manifestation, then there are plenty of decisive conclusions to be gleaned. Like I said - in this respect, there is no mystery.
 
  • #96
Originally posted by Lifegazer
I was trying to explain why an eternal inflationary-universe was not a viable possibility. I.e.; I was trying to show why time/change/motion has a beginning.

Of course you can show that, but don't forget you can also and equally show that the opposite is true also: that time can't have a beginning. (see thread: https://www.physicsforums.com/showthread.php?s=&threadid=958").
Don't forget about that! i tried to bring that fact into your mind many times.

It is impossible that a finite entity should have no limits to its physical parameters of existence. That would make it an infinite physical-entity.

Not true. For instance the surface of the Earth has a finite size, but it is not limited. Nowhere you fall off the earth.

If we are to apply reason to physical manifestation, then there are plenty of decisive conclusions to be gleaned. Like I said - in this respect, there is no mystery.

Except for the mysteries you introduce yourself, when coming up with the concept of a "beginning of time, space, matter, motion", etc. which enables you to come up with this deity thing again..
 
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  • #97
Originally posted by Lifegazer
You're just semi-correct. An eternal inflationary-universe is not logically possible. There's no paradox about it (since it's not a mystery).
... If anything has been inflating for eternity, and there is still space outside of itself in order to maintain the inflation, then that thing has to be a finite entity. Therefore, its inflationary-time is definitely finite.
A finite object cannot inflate for an eternity - it needs an origin of time for the process to begin. And an infinite object has no rational meaning (therefore, as it does not exist, it cannot inflate).

You're dead wrong here. The eternal inflation paradigm says that the current universe comes out of an inflated region of space which was finite in size, but which is part of a larger universe, that is infinite in size and has infinite history.
The finite object you refer to (the space-time bubble we call "our universe") has a definite begin, but that is not a begin of time as such. The eternal inflation paradigm states that the inflationary universe reproduces itself, so it came out of a previously inflating spacetime-bubble, and this process can go on in all eternity.
 
  • #98
Originally posted by Lifegazer
I was trying to explain why an eternal inflationary-universe was not a viable possibility. I.e.; I was trying to show why time/change/motion has a beginning.

It is impossible that a finite entity should have no limits to its physical parameters of existence. That would make it an infinite physical-entity.

If we are to apply reason to physical manifestation, then there are plenty of decisive conclusions to be gleaned. Like I said - in this respect, there is no mystery.

This is paraconsistent logic which is also applicable to Quantum Mechanics and any number of paradoxes from which useful and decisive conclusions can be drawn. The difference is, Quantum Mechanics is an applied reality while this is pure speculation. I could literally (?) speculate endlessly about eternity and infinity without finding a single useful bit of information. Thus it has no advantage over any other possible answer.
 
  • #99
Originally posted by heusdens
Of course you can show that, but don't forget you can also and equally show that the opposite is true also: that time can't have a beginning. (see thread: https://www.physicsforums.com/showthread.php?s=&threadid=958").
Don't forget about that! i tried to bring that fact into your mind many times.
Yes; and now you have brought that to my attention, I find your reasoning to be corrupt (not in an immoral sense). I would also advise people to read that thread. They'll discover a few facts:-
1. You advocate that infinite-time is illogical. In fact, your first sentence here is an acknowledgment of this fact.
2. You have no reasonable disproof of a finite causality-chain. The reader should be aware that you (and Tom) just refuse to accept such a conclusion because you both realize that the conclusion infers the existence of 'God'.
3. Your decision to accept '1' is forced upon you by your absolute reluctance to accept the existence of 'God.
4. Your decision to accept '1' is a decision to accept an illogical premise.
5. Your refusal to accept a finite causality-chain is therefore a decision founded upon bias or incredulity. It is not a decision which reflects a reasoned analysis of the concepts involved.
 
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  • #100
Originally posted by Lifegazer
Yes; and now you have brought that to my attention, I find your reasoning to be corrupt (not in an immoral sense). I would also advise people to read that thread. They'll discover a few facts:-
1. You advocate that infinite-time is illogical. In fact, your first sentence here is an acknowledgment of this fact.
2. You have no reasonable disproof of a finite causality-chain. The reader should be aware that you (and Tom) just refuse to accept such a conclusion because you both realize that the conclusion infers the existence of 'God'.
3. Your decision to accept '1' is forced upon you by your absolute reluctance to accept the existence of 'God.
4. Your decision to accept '1' is a decision to accept an illogical premise.
5. Your refusal to accept a finite causality-chain is therefore a decision founded upon bias or incredulity. It is not a decision which reflects a reasoned analysis of the concepts involved.

What is corrupt in my reasoning?

The reasoning is as follows. Both the finiteness (beginning) of time and the infiniteness of time are provable to be absurd, and refusing one, means to accept the other. Ultimately, however, the issue is contradictionary, and remeans so. Cause any attempt to remove the contradiction, creates even more absurd or profound contradictions.

Do you accept that?


Dialectical-materialism incorporates that in their central premises, and so the use of dialectical reasoning (dialectical reasoning is about contradictions) is a part of the very reasoning itself.

We can not escape from that situation.

The arbitrary introduction of a Deity does in total not remove the inherent contradiction, but creates an absurdity in it's own terms.
Because of that, such an artificial addition to reality, is refused.


Some coments:

1. I did not state that infinite time is illogical. I would state quite the opposite that it follows normal reasoning. The only thing that can be said about the infiniteness of time, is that the concept of inifinity isself is a contradictionary term in it's own. The attempt to remove this contradiction, is to remove infinity, which leaves us with the equal, or even more absurd proposition of having time 'started'. What was before that time? A mere nothingness? An unchanging-existence? Where did the first change come from?

2. The disproof of finite-causality, or better stated the proof that such can not be the case, is because it would require time, matter, motion and space to have begun at some 'time' (a time in which in fact, there was no time!). This is inacceptable. There is no physical evidence that such a thing can happen. On the other hand, there is plenty of evidence that matter can only exist in eternal, neverlasting motion, as this is seen to be the case.

3. The infinitness of time can be well understood and is based on theorems, which we base on material knowledge. Matter does not appear out of nothing. Matter only is in a constant and endless proces of transforming, changing, moving. This can not be said to have begun or end, and therefore the material world, the universe, is unfolding endlessly without begin or end.

4. We have no reason to assume that things in the past or the future work differently as they do now. If one assumes the past or the future the physical laws were different, it is up to that person assuming that to give us proof of that.

5. In part you already accepted the idea that there must be always something, and that at no point in time there can be 'nothing'. This is a reasonable proposition to conclude that therefore an existing material universe, in whatever material form or shape, must have been existing at all time, that is in all of eternity, endlesly.

6. Even when we are stubborn, and refuse the more obvious conclusions, which I have drawn here, and postulate the existence of some 'unknown/unknowable' Deity, what would it help? Is a Deity necessary to 'create' a universe? To create the universe in this manner of speaking would imply that before (before the universe existed, before time [whatever that can mean]) it (the unvierse)did not exist.
What existed before, or what was the state of the world before that? The mere nothing, or "notingness"? That can't be the case for logical reasons, and secondly, then also this Deity which was called for help, did not exist. So, that in fact means that a pre-existing Deity transforms into the world, and becomes the world. In fact it denotes a continuous transformation, not an act of 'creation' (as in 'creation ex nihilo'). But this ain't very helpfull, because instead of explaining the world, and where it comes from, it necessitates us to explain where this Deity came from. Same problems here as for the world itself.

7. So, this attempt doesn't work neither, for obvious reasons. What else might work then? Well, if neither the obvious (an endless, eternal and infinite existence) nor a pre-existing Deity might help, the only other option is that of a beginning of time, which started out of an absolute nothing. Before time, there was nothing. This implies us to believe that motion arises out of no motion, matter out of nothing, and time and space popup all by themselves. It implies us to accept that the "nothingness" is a real existing state of the world, which happens to have existed before the world started to exist. And that "out of nothing" (although it is a state which can not imply any form of change), all of a sudden everything pops out.

Excuse me, Mr Lifegazer, but such a thing I simply refuse to believe.
 
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