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Suppose we had closed, collapsing universe with a uniform thermal distribution of low energy photons like that of the CMB and no other matter (I suppose we must pick the initial conditions right for collapse to occur) . As time goes by the temperature of the radiation increases?

By varying initial conditions can we vary the time T for collapse?

I assume things heat up, when the average energy per photon is greater then any mass in the standard model can we expect some fraction of energy initially in the photons will now be divided among all the fields of the standard model (with some possible asymmetry between matter and antimatter via the Standard Model)?

At energies well above any mass of the standard model can one argue that all the fields should share energy roughly equally? Would we have enough time for energy to become completely divided between all the fields of the standard model?

Finally, does this collapsing universe in some last moments undergo the inverse of inflation?

Thanks for any help!

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# Closed, collapsing universe+only photons at first -> matter when hot?

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