Many advocates of General Relativity and Big Bang Theory are dedicated to the position that space and time originated with the big bang. Though many of them say that we can’t know anything about conditions before the big bang, they are comfortable that the big bang came from nothing. There was no space. There was no time. All there was at that instant was an infinitely tiny, infinitely dense, infinitely curved (or closed) singularity, something that didn’t exist in space or time until the instant of the big bang.
According to the theory, the big bang could and did occur without space or time, and allows for space-time to originate at the instant of the big bang.
Theoretically if neither space nor time is necessary for the big bang itself to occur, it is logical for the big bang to be making its own space-time as it expands.
But on the other hand, before the instant of the big bang can you logically deduce that there was no space; that there was no time?
As the big bang universe expands, the density is said to be thinning and the curvature is said to be flattening. Current estimates show that the expansion of the known universe is accelerating and if that is the case it is "open" or "flat" as opposed to "closed" and will expand forever.
I can’t see how the known universe, or any observations, or any evidence would be any different if space and time did exist before the big bang.
But I can see how increasing entropy in the expanding big bang universe would eventually cause it to cool and disburse until no life could exist.
Even though this severe entropy isn’t likely to occur for billions and billions of years, I am concerned about it.
It doesn’t have to be that way.
Maybe it isn’t that way.
Here’s why I say that.
Maybe there is a grander universe in which our big bang is playing out. As the big bang expands it will merge and mingle with the greater universe from which it came. As it merges and mingles it will bring an influx of new useable energy to be disbursed across a great expanse of the greater universe solving the problem of increasing entropy.
Maybe our big bang universe came from a big crunch in the grander universe; a big crunch that consolidated all of the cold matter and un-useful energy from a large area or arena in the greater universe. Gravity consolidated all of that matter and energy into an infinitely dense mass that then triggered the big bang.
Maybe big crunches and big bangs are commonplace in the greater universe.
The big bang universe expands right back into the greater universe and brings to it a new influx of useable energy which solves the entropy problem. Our big bang infusion will be spread out and shared across a great expanse of the greater universe before it eventually gets crunched piecemeal into innumerable other big crunches taking place over trillions and trillions of years across trillions and trillions of light years in the space-time of the greater universe.
The greater universe would be relativistic, infinite, flat, homogeneous and isotropic on a large scale; matter and vacuum energy would be in balance and infinite, the cosmological constant would be at critical density; the greater universe would have always existed, and because entropy would be solved will be able to support life forever.
There, now I feel better.