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Priyank
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If the universe was created by the Big Bang, then how did Multiverse come into existence?
Oh, yeah there are notable physicists who contend that the multiverse is inevitable but I think they are carried away by the implication of quantum mechanics and the thesis that "if something CAN happen then it HAS TO happen", which I don't agree with.Garth said:I absolutely agree with you phinds,however many in the community do not and for them the multiverse is as real, and as a consequence of, inflation.
The big bang is fiction. It arises from carrying certain models of the universe back in time to higher energies than those models can possibly describe with any accuracy.Priyank said:If the universe was created by the Big Bang, then how did Multiverse come into existence?
Chalnoth said:The big bang is fiction. It arises from carrying certain models of the universe back in time to higher energies than those models can possibly describe with any accuracy.
The problem is taking it to the point where the energies become infinite. It is infinities that are generally called "singularities" in physics because they are not believed to represent reality but rather a place where the theory breaks down and the math gives an answer that is not likely to represent physical reality.martinbn said:So what is the energy limit that GR can model with accuracy? Why should there be any limit? There aren't any experiments or observations to show that.
phinds said:There is absolutely ZERO evidence that there IS a multiverse. Many of us think it is an unnecessary mathematical fiction.
For a long time the inflation theorists couldn't come up with any mechanism by whichGarth said:I absolutely agree with you phinds, however many in the community do not and for them the multiverse is as real [as], and [is] a consequence of, inflation...
Garth
Priyank, there is no evidence that the universe was "created" by the start of expansion. There are models which fit the observational data just as well according to which the current expansion was preceded in time by a contraction of the universe, which rebounded.Priyank said:If the universe was created by the Big Bang, then...?
It's not completely clear. Certainly it can't go above the Planck scale, though there's a fair chance it starts to become inaccurate before that.martinbn said:So what is the energy limit that GR can model with accuracy? Why should there be any limit? There aren't any experiments or observations to show that.
Chalnoth said:It's not completely clear. Certainly it can't go above the Planck scale, though there's a fair chance it starts to become inaccurate before that.
The big bang requires that GR be accurate to infinite energy, however.
martinbn said:What's the reason for that? As it stands it seems as an expectation, which may turn out to be correct or not, but is there an argument for it.
martinbn said:That's what I don't understand! I would phrase it as the big bang requires that GR is accurate to arbitrarily large energies. But I wouldn't say infinite.
ChrisVer said:GR is a classical theory. At the Planck Scale however, the gravity in the elementary particles level becomes comparable to the rest of fundamental forces (or GUT). So you'd expect for quantum gravity effects to rule over the classical predictions of GR...as a result, it starts not giving accurate results (we don't have a quantum gravity theory)
Infinite is just a word... you could translate it as any arbitrary "large" number if you like it more that way. But "arbitrary" can send you as much high as you can imagine...
If you are interested in the universe and how it works, why not focus on the REAL universe instead of hypothetical things that probably don't even exist? I can assure you there are plenty of interesting thing to focus on in the real world.Priyank said:I read all of your views, but honestly speaking, I understood very little. I am very keen about this universe and its functioning.
My next question to you all is : Can Tachyonic world bear some organisms having v=c. Can they come to The Einsteinian world, the world in which we live...?
martinbn said:Exactly, it is what I would expect, but is only an expectation. It need not be the case.
martinbn said:y=x^2 is defined for all real numbers and does not become infinite at any real number. It grows to infinity, it can have as large values as you wish, but it is never infinite. So there's absolutely no problem with this function. Same with the space-time manifold (for the FLWR case or any other) all fields have finite values at any point of the manifold. Some may grow unbounded in some directions but that is not the same as being infinite (having an infinite value) at a given point.
#phinds, please give me the real topics which you are telling abt?phinds said:If you are interested in the universe and how it works, why not focus on the REAL universe instead of hypothetical things that probably don't even exist? I can assure you there are plenty of interesting thing to focus on in the real world.
Start by reading the entries in the cosmology FAQ on this forum.Priyank said:#phinds, please give me the real topics which you are telling abt?
Priyank said:My next question to you all is : Can Tachyonic world bear some organisms having v=c. Can they come to The Einsteinian world, the world in which we live...?
You are asking too much. Get a book on some area of science that interest you and read it.Priyank said:#Phinds, I am a student of 9th Standard.
So, can you please give me a brief description abt all the theories and definitions.
Internet can't make me understand
Nope buddy... Something like 'Life', Yes.ChrisVer said:Organisms? Like having life? It doesn't make sense...
Being new is no excuse for bad manners and for asking too much of people as though they were your servants. As Vanadium said, you will get better results with a better attitude.Priyank said:please forgive me... I m new here... please :(
OK man, calm down! I'm sure people have forgiven you by now.Priyank said:Sorry again,
I ll promise I won't misbehave from now...
Please forgive me and accept me as your friend... Please