Cosmological Constraints on Late-time Entropy Production

Details Cosmological Constraints on Late-time Entropy Production Cosmological Constraints on Late-time Entropy Production

1998-11-27

arxiv.org/abs/astro-ph/9811437v2

Phys.Rev.Lett.82:4168,1999

Astronomy and Astrophysics

Astrophysics

4 pages, using RevTeX and five postscript figures, comments added, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.82.4168

We investigate cosmological effects concerning the late-time entropy production due to the decay of non-relativistic massive particles. The thermalization process of neutrinos after the entropy production is properly solved by using the Boltzmann equation. If a large entropy production takes place at late time t$\simeq$ 1 sec, it is found that a large fraction of neutrinos cannot be thermalized. This fact loosens the tight constraint on the reheating temperature T_R from the big bang nucleosynthesis and T_R could be as low as 0.5 MeV. The influence on the large scale structure formation and cosmic microwave background anisotropies is also discussed.

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