Thermodynamics of the early Universe with mirror dark matter

Details Thermodynamics of the early Universe with mirror dark matter Thermodynamics of the early Universe with mirror dark matter

2008-09-03

arxiv.org/abs/0809.0677v2

Phys.Rev.D78:123003,2008

Astronomy and Astrophysics

Astrophysics

7 pages, 4 figures, 3 tables; changed values in Table I + minor changes

Scientific paper

10.1103/PhysRevD.78.123003

Mirror matter is a promising self-collisional dark matter candidate. Here we study the evolution of thermodynamical quantities in the early Universe for temperatures below ~100 MeV in presence of a hidden mirror sector with unbroken parity symmetry and with gravitational interactions only. This range of temperatures is interesting for primordial nucleosynthesis analyses, therefore we focus on the temporal evolution of number of degrees of freedom in both sectors. Numerically solving the equations, we obtain the interesting prediction that the effective number of extra-neutrino families raises for decreasing temperatures before and after Big Bang nucleosynthesis; this could help solving the discrepancy in this number computed at nucleosynthesis and cosmic microwave background formation epochs.

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