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Poached Egg’s common sense cosmology

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Big Bang Theory/NASA

Take two of these:

4) We cannot appeal to the singularity as the cause of the universe. If the big bang singularity is precisely nothing, we are left with the question of how the universe then came into existence out of nothing. Others have argued that a big bang singularity would be a real physical state; but if so it would still just exist at the time t=0. In that case we have to ask “how did the singularity come into existence out of nothing?”

5) Some speculate that future scientific research will provide strong evidence in favour of cosmologies that avoid a beginning of the universe. For example, in the oscillating universe model the universe expands, then collapses back on itself, then expands again, and so on. However, many such models turn out to be incompatible with an infinite number of cycles and so do not avoid the beginning. Furthermore, our current evidence indicates that our universe will not collapse back in on itself… More.

when you hear: Blueprint for science without evidence

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So what caused the wave function collapse that resulted in the initial (enormous) quantity of mass-energy? -Q Querius
These are interesting arguments. I am particularly interested in #1 on the list, the part I bolded in particular:
If the universe has only been in existence for a finite amount of time, then it is rational to believe that the universe began to exist. If the big bang theory is true, it provides strong evidence that our universe has only existed for a finite amount of time and, therefore, that our universe began to exist.
I notice that the author does not say that if the universe has been in existence for a finite amount of time, then it necessarily follows that the universe began to exist. I can conceive of a scenario (or at least a mathematical model/analogy) in which a finitely old universe did not begin to exist. Is it therefore also rational to believe that a finitely old universe did not begin to exist? daveS

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