Physics Asked by Kawaljeet Kaur on January 8, 2021
We study in thermal physics that no natural processes are reversible i. e. they are irreversible, so size of universe, it’s also natural process. Why we still say big crunch theory a theory, why can’t we just neglect it and say that universe is expanding and will expand forever on the basis of principle I put forward above.
So does means that theory is wrong or basic principle of thermal physics is wrong or something else?
I am not so sure so if I said anything wrong about this concept feel free to correct also.
I think you are assuming that a hypothetical Big Crunch would be like the Big Bang in reverse. This is not correct. Matter and radiation in the early universe had a very uniform distribution, which (due to gravity) was a very improbable state, with low entropy. If the universe were to contract into a Big Crunch then stars and galaxies would first collapse into massive black holes, leading to a state with very high entropy. The final stages would not resemble the Big Bang at all.
We no longer think that the universe is headed towards a Big Crunch, but it is not ruled out because of thermodynamics.
Answered by gandalf61 on January 8, 2021
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