Dark Matter Production in Late Time Reheating
Dark Matter Production in Late Time Reheating
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DOI：
10.1103/physrevd.89.083532
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发表时间：
2014-02
影响因子：
5
通讯作者：
K. Harigaya;M. Kawasaki;K. Mukaida;Masaki Yamada
中科院分区：
文献类型：
--
作者：
K. Harigaya;M. Kawasaki;K. Mukaida;Masaki Yamada
我们估计宇宙的暗物质密度，再加热温度小于暗物质的质量，假设暗物质是一个弱相互作用的大质量粒子。在再加热过程中，中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。暗物质是通过这些非弹性散射过程和高能粒子对产生过程产生的。我们适当地考虑了Landau-Pomeranchuk-Migdal效应对非弹性过程的影响，结果表明暗物质的能量密度比文献中估计的要大得多，并且当暗物质的质量大于O（100）GeV时，与观测到的能量密度是一致的.
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 inaton 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 eect 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.