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arXiv 1507.06164hep-phastro-ph.CO
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低再热温度的轴子暗物质

Axino dark matter with low reheating temperature

Leszek Roszkowski, Sebastian Trojanowski, Krzysztof Turzynski

摘要:

我们研究了轴子暗物质在膨胀后的低再加热温度T_R的区域,并考虑到再加热是一个非瞬时过程。这可能对暗物质丰度产生重大影响,主要是由于暴胀子衰变中的熵产生。我们研究了热和非热生产的axinos的背景下,MSSM与10个自由参数。我们确定的范围内的轴子质量和再加热温度所允许的LHC和其他粒子物理数据在不同的模型的轴子相互作用。我们面对这些限制与宇宙学的约束来观察到的暗物质密度,大结构的形成和大爆炸核合成。我们发现了一些差异的现象学上可接受的值的axino质量和再加热温度相对于以前的研究。特别是,轴子质量的上限变得依赖于T_R,在T_R~10^2 GeV时达到最大值。如果最轻的普通超对称粒子是wino或higgsino,则再加热温度的下限约为10 GeV。我们还表明,在再加热过程中的熵产生影响的最大允许轴子质量和最低值的再加热温度。

英文摘要:

We examine axino dark matter in the regime of a low reheating temperature T_R after inflation and taking into account that reheating is a non-instantaneous process. This can have a significant effect on the dark matter abundance, mainly due to entropy production in inflaton decays. We study both thermal and non-thermal production of axinos in the context of the MSSM with ten free parameters. We identify the ranges of the axino mass and the reheating temperature allowed by the LHC and other particle physics data in different models of axino interactions. We confront these limits with cosmological constraints coming the observed dark matter density, large structures formation and big bang nucleosynthesis. We find a number of differences in the phenomenologically acceptable values of the axino mass and the reheating temperature relative to previous studies. In particular, an upper bound on the axino mass becomes dependent on T_R, reaching a maximum value at T_R~10^2 GeV. If the lightest ordinary supersymmetric particle is a wino or a higgsino, we obtain lower a limit of approximately 10 GeV for the reheating temperature. We demonstrate also that entropy production during reheating affects the maximum allowed axino mass and lowest values of the reheating temperature.

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