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arXiv 2302.05129hep-ph
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暗物质动能平衡的朗之万模拟

Langevin simulation of dark matter kinetic equilibration

Seyong Kim, M. Laine

备注：
15 pages. v2: clarifications added
发表信息：
JCAP 05 (2023) 003
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AI总结：

针对共振效应导致冻结动力学低温下动能平衡效率存疑的问题，提出用朗之万模拟研究非相对论粒子非平衡动量分布，验证了60GeV标量单态暗物质在1GeV下动能平衡近似有效，且所需耦合比平衡态高不足20%。

摘要：

近期，尤其是在标量单态暗物质模型（$m_φ^{ }\thickapprox 60$ GeV）的背景下，有研究质疑：如果共振效应将冻结动力学推至低温，动能平衡能以多高的效率维持。我们概述了如何利用朗之万（Langevin）模拟来研究宇宙学背景下非相对论粒子的非平衡动量分布。对于质量$m_φ^{ }\thickapprox 60$ GeV的标量单态，这些模拟表明，在低至$T \thicksim 1$ GeV的温度下，动能平衡仍是良好的近似，偏差首先表现为红倾斜谱。这会降低湮灭截面，证实了其他方法的结论：为得到正确的丰度，所需的耦合比平衡态下的耦合稍大（增幅$<20\%$）。

英文摘要：

Recently it has been questioned, notably in the context of the scalar singlet dark matter model with $m_φ^{ }\simeq 60$ GeV, how efficiently kinetic equilibrium is maintained if freeze-out dynamics is pushed down to low temperatures by resonant effects. We outline how Langevin simulations can be employed for addressing the non-equilibrium momentum distribution of non-relativistic particles in a cosmological background. For a scalar singlet mass $m_φ^{ }\simeq 60$ GeV, these simulations suggest that kinetic equilibrium is a good approximation down to $T \sim 1$ GeV, with the deviation first manifesting itself as a red-tilted spectrum. This reduces the annihilation cross section, confirming findings from other methods that a somewhat larger ($ < 20\%$) coupling than in equilibrium is needed for obtaining the correct abundance.

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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