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arXiv 1402.2846hep-phastro-ph.CO
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再加热后期的暗物质产生

Dark Matter Production in Late Time Reheating

Keisuke Harigaya, Masahiro Kawasaki, Kyohei Mukaida, Masaki Yamada

摘要:

假设暗物质是一种弱相互作用的大质量粒子,我们估计了再加热温度小于暗物质质量的宇宙的暗物质密度。在再加热过程中,暴胀子衰变并释放出高能粒子,这些粒子被热等离子体非弹性散射并发射出许多粒子。暗物质是由高能粒子通过这些非弹性散射过程和对产生过程产生的。我们适当地考虑了Landau-Pomeranchuk-Migdal效应对非弹性过程的影响,结果表明,当暗物质的质量大于$O(100)$ GeV时,得到的暗物质的能量密度比文献中估计的要大得多,并且与观测到的能量密度一致.

英文摘要:

We estimate dark matter density for the Universe with a reheating temperature smaller than the mass of dark matter, assuming dark matter to be a weakly interacting massive particle. During the reheating process, an inflaton decays and releases high-energy particles, which are scattered inelastically by the thermal plasma and emit many particles. Dark matters are produced through these inelastic scattering processes and pair creation processes by high-energy particles. We properly take account of the Landau-Pomeranchuk-Migdal effect on inelastic processes and show that the resultant energy density of dark matter is much larger than that estimated in the literature and can be consistent with that observed when the mass of dark matter is larger than $O(100)$ GeV.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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