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How does you model avoid this issue?"The mainstream version of the Cold Big Bang model predicted an absence of acoustic peaks in the cosmic microwave background radiation[1] and was eventually explicitly ruled out by WMAP observations.[2]"fromhttps://en.wikipedia.org/wiki/Cold_Big_Bang
It's hard to explain. But not impossible.
The big problem is that it's easy to see how the universe started hot, and cooled down.But it it started cold, what warmed it up?Lemaitre's answer would probably have been " an act of God", but that won't work on a science site.
A degenerate space phase.
Quote from: BilboGrabbins on 22/08/2021 20:31:24A degenerate space phase.Could you expound on that statement?
Is it sensible to treat the observable universe as being filled with an extremely diffuse gas, or is it too close to a vacuum for that to work? If so, you could use the gas laws to estimate the average temperature of the Universe at arbitrary points in the past. Or is that too much of a simplification?
the mainstream view saying that the universe began in a hot primordial state with low entropy.This violates the principles of thermodymamical laws, since only systems which approach near absolute zero retain a minimal entropy.
Quote from: BilboGrabbinsthe mainstream view saying that the universe began in a hot primordial state with low entropy.This violates the principles of thermodymamical laws, since only systems which approach near absolute zero retain a minimal entropy.We can see how the expansion of the universe turned a hot, dense mass into a cooler, diffuse universe, without violating thermodynamics or entropy.The Hot Big Bang theory doesn't say that the universe was in the lowest possible entropy - it just says it had less entropy than it does now (and we expect this trend to continue into the future). A black hole has pretty low entropy - but a black hole has radiated away all of its mass via Hawking radiation (over enormous periods of time) has slightly lower entropy again. So we expect that (in the extremely long term view), the universe will be colder than it is now, and energy will be spread even more diffusely.