How Do We Know Time, Space, and Matter Were Created in the Universe?

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I know that we all know about the big bang. We say that is is what created time, space, and matter. However, how do we know through science that time space and matter were in fact created? (Let us not go into issues about god). I was thinking that our universe has always existed that there have been many big crunches and big bangs, in which our universe has started over again? What are your thoughts on this?
 
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I think that this coincides nicely with Mayan religion, about how the universe restarts, and every time beings get more complex. (they predicted the next apocalypse and universe restart in the year 2012) They also believe that at some point we will be such complex beings that telepathy will be the new form of communication.
 
My personal theory happens to be that our universe has always existed, simply in another dimension, and that the big bang was actually the opening of a wormhole in which all life from that other dimension was extinguished from the pressure of said wormhole. This would explain why there is everything necessary for life available in our universe. I think that this is a slightly more logical hypothesis than the theory of spontaneous generation of EVERYTHING.
 
redhedkangaro said:
I know that we all know about the big bang. We say that is is what created time, space, and matter. However, how do we know through science that time space and matter were in fact created?
Well, no, actually, we don't know that. While the big bang theory has a singularity in the finite past, we can't actually take the theory seriously that far back. And while we do know that our own region had to have a beginning at some point, we currently have no way to say whether or not that beginning was from nothing, or from some other space-time.

redhedkangaro said:
I was thinking that our universe has always existed that there have been many big crunches and big bangs, in which our universe has started over again? What are your thoughts on this?
Well, I think the whole "bouncing universe" idea is highly unlikely to be accurate. It basically requires that the entropy monotonically decrease after some point in time. And besides, it looks like our own region will probably expand forever, so it seems doubtful that it will ever collapse back on itself. Here is one attempt at describing this which, personally, seems rather more likely to me:
http://arxiv.org/abs/hep-th/0410270
 
It seems we know back about 99% of the way to the supposed big bang rather clearly on both theoretical and experimental (measurement) basis...how it all got started is less clear. It seems like inflationary cosmology fits experimental data rather well, like filaments, galaxy clusters and so forth. Before that?? who knows??

Was our universe a once in a lifetime, highly unlikely, "miracle"? Seems more likely to me its a process that goes on all the time...in a virtually infinite cosmos likely an infinite number of universes are born and many die without evolution...perhaps those that evolve, like ours, somehow spawn others...a darwinian style natural selection.

However since nobody even knows exactly what time, space, matter,energy, etc really are and exactly how they are related, let alone "dark" forms, likely we have a lot yet to learn. Maybe some universes bounce, others like ours expand forever...in an infinite number of chances, everything must happen...
 
https://en.wikipedia.org/wiki/Recombination_(cosmology) Was a matter density right after the decoupling low enough to consider the vacuum as the actual vacuum, and not the medium through which the light propagates with the speed lower than ##({\epsilon_0\mu_0})^{-1/2}##? I'm asking this in context of the calculation of the observable universe radius, where the time integral of the inverse of the scale factor is multiplied by the constant speed of light ##c##.
The formal paper is here. The Rutgers University news has published a story about an image being closely examined at their New Brunswick campus. Here is an excerpt: Computer modeling of the gravitational lens by Keeton and Eid showed that the four visible foreground galaxies causing the gravitational bending couldn’t explain the details of the five-image pattern. Only with the addition of a large, invisible mass, in this case, a dark matter halo, could the model match the observations...
Hi, I’m pretty new to cosmology and I’m trying to get my head around the Big Bang and the potential infinite extent of the universe as a whole. There’s lots of misleading info out there but this forum and a few others have helped me and I just wanted to check I have the right idea. The Big Bang was the creation of space and time. At this instant t=0 space was infinite in size but the scale factor was zero. I’m picturing it (hopefully correctly) like an excel spreadsheet with infinite...
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