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

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The discussion centers on the origins of time, space, and matter, questioning the validity of the Big Bang theory as the definitive creation event. Some participants propose alternative theories, such as the universe undergoing cycles of expansion and contraction, while others argue against the feasibility of a "bouncing universe" due to entropy concerns. The conversation highlights the uncertainty surrounding the beginnings of the universe, emphasizing that while we understand much about the universe's evolution, the exact nature of its inception remains elusive. There is speculation about the possibility of multiple universes and the idea that our universe could be one of many in an infinite cosmos. Overall, the dialogue reflects a deep curiosity about the fundamental nature of existence and the processes that govern 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...
 
Abstract The Event Horizon Telescope (EHT) has significantly advanced our ability to study black holes, achieving unprecedented spatial resolution and revealing horizon-scale structures. Notably, these observations feature a distinctive dark shadow—primarily arising from faint jet emissions—surrounded by a bright photon ring. Anticipated upgrades of the EHT promise substantial improvements in dynamic range, enabling deeper exploration of low-background regions, particularly the inner shadow...
what is the current status of the field for quantum cosmology, are there any observations that support any theory of quantum cosmology? is it just cosmology during the Planck era or does it extend past the Planck era. what are the leading candidates into research into quantum cosmology and which physics departments research it? how much respect does loop quantum cosmology has compared to string cosmology with actual cosmologists?
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