- #1
QuarkDecay
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- TL;DR Summary
- FRW Models and densities
Can we say that a universe with a radiation density (only) exists only in near a Big Bang time, and not a Big Crunch? Since it gets much smaller as time passes.
For example in here:
http://www.nat.vu.nl/~wimu/Varying-Constants-Pictures/Time-Scale-Universe.jpg
We have different cosmological models for different times. But what about their densities?
For example, in the closed Universe with k=+1 and without a cosmological constant. Can we say that at Big Bang we only have the radiation density, but in the Big Crunch only the matter density?
For example in here:
http://www.nat.vu.nl/~wimu/Varying-Constants-Pictures/Time-Scale-Universe.jpg
We have different cosmological models for different times. But what about their densities?
For example, in the closed Universe with k=+1 and without a cosmological constant. Can we say that at Big Bang we only have the radiation density, but in the Big Crunch only the matter density?