MeV-mass dark matter and primordial nucleosynthesis

被引：107

作者：

Serpico, PD ^{[1
]}

Raffelt, GG ^{[1
]}

机构：

[1] Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst, D-80805 Munich, Germany

来源：

PHYSICAL REVIEW D | 2004年 / 70卷 / 04期

关键词：

D O I：

10.1103/PhysRevD.70.043526

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 H-2, He-4, and Li-7. If the new particles are in thermal equilibrium with neutrinos during the nucleosynthesis epoch they increase the helium mass fraction for m(X)less than or similar to10 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 H-2 and He-4 abundances.

引用

页数：10

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