MeV-mass dark matter and primordial nucleosynthesis

Details MeV-mass dark matter and primordial nucleosynthesis MeV-mass dark matter and primordial nucleosynthesis

2004-03-17

arxiv.org/abs/astro-ph/0403417v2

Phys.Rev. D70 (2004) 043526

Astronomy and Astrophysics

Astrophysics

11 pages, 10 figures, references and two appendices added, conclusions unchanged; accepted for publication in Phys.Rev.D

Scientific paper

10.1103/PhysRevD.70.043526

The annihilation of new dark matter candidates with masses $m_X$ in the MeV range may account for the galactic positrons that are required to explain the 511 keV $\gamma$-ray flux from the galactic bulge. We study the impact of MeV-mass thermal relic particles on the primordial synthesis of $^2$H, $^4$He, and $^7$Li. If the new particles are in thermal equilibrium with neutrinos during the nucleosynthesis epoch they increase the helium mass fraction for $m_X\alt 10$ MeV and are thus disfavored. If they couple primarily to the electromagnetic plasma they can have the opposite effect of lowering both helium and deuterium. For $m_X=4$--10 MeV they can even improve the overall agreement between the predicted and observed $^2$H and $^4$He abundances.

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