Precise WIMP dark matter abundance and Standard Model thermodynamics
Precise WIMP dark matter abundance and Standard Model thermodynamics
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DOI：
10.1088/1475-7516/2020/08/011
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发表时间：
2020-05
影响因子：
6.4
通讯作者：
K. Saikawa;S. Shirai
中科院分区：
文献类型：
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作者：
K. Saikawa;S. Shirai
弱相互作用大质量粒子（WIMP）是暗物质的主要候选者。WIMP暗物质丰度是由冻结机制决定的。一旦我们知道了WIMP粒子的质量和相互作用等性质，我们就可以预测暗物质的丰度。然而，对WIMP暗物质丰度的估计存在一些不确定性。在这项工作中，我们专注于标准模型热力学的影响。我们回顾了WIMP暗物质丰度的估计及其不确定性，由于在标准模型的状态方程（EOS）。我们采用了标准模型早期宇宙状态方程的最新估计，发现1-1000 GeV的暗物质丰度与传统的状态方程估计值相差近10%。
A weakly interacting massive particle (WIMP) is a leading candidate of the dark matter. The WIMP dark matter abundance is determined by the freeze-out mechanism. Once we know the property of the WIMP particle such as the mass and interaction, we can predict the dark matter abundance. There are, however, several uncertainties in the estimation of the WIMP dark matter abundance. In this work, we focus on the effect from Standard Model thermodynamics. We revisit the estimation of the WIMP dark matter abundance and its uncertainty due to the equation of state (EOS) in the Standard Model. We adopt the up-to-date estimate of the EOS of the Standard Model in the early Universe and find nearly 10% difference in the 1–1000 GeV dark matter abundance, compared to the conventional estimate of the EOS.