暖暴胀中由标量子驱动的暗物质通过紫外冻结产生机制
Scalaron-driven Dark Matter during Warm Inflation via UV Freeze--in
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中文总结 AI 辅助
该研究在暖HS暴胀中，利用紫外冻结产生机制，揭示暗物质在暴胀末期的产生规律，为理解暗物质起源提供了新视角。
中文摘要 AI 辅助
我们在暖希格斯-斯塔罗宾斯基（HS）暴胀框架内研究暗物质（DM）的产生。采用紫外（UV）冻结产生机制——暗物质数密度初始可忽略，但随时间通过具有确定质量量纲的非重正化相互作用逐渐积累——我们发现HS势内的暗物质产生具有特征时间。对于暗物质质量m_χ=1 MeV和m_χ=100 GeV两种情况，暗物质产额均出现在暴胀终止并向辐射主导（RD）时期过渡的附近。在强耗散区域内，质量量纲D={8,9}的非重正化算子为两种暗物质质量均生成了当前暗物质残余丰度。所得结果表明，HS势的形式及相关标量子动力学有利于在标量子趋近势的极小值时产生紫外冻结产生暗物质，此时向热浴的能量转移尤为高效。这一独特的过渡行为使HS模型有别于其他暴胀模型，并深化了我们对暗物质产生的理解。
英文摘要
We investigate the production of Dark Matter (DM) within the warm Higgs--Starobinsky (HS) inflation. By adopting the ultraviolet (UV) freeze--in mechanism -- where the DM number density is initially negligible but is populated over time through non-renormalizable interactions of defined mass dimensions -- we find that the DM production within the HS potential has a characteristic timing. For both DM masses, $m_χ=1$ MeV and $m_χ=100$ GeV, the yield of DM occurs close to the termination of inflation and its transition to the radiation dominated (RD) era. The present--day DM relic abundance is generated for both DM masses with non-renormalizable operators of mass dimension $D=\{8,9\}$ within strong dissipation regimes. The obtained results suggest that the form of the HS potential and the associated scalaron dynamics favor UV freeze--in DM production as the scalaron approaches the minimum of the potential, where energy transfer to the thermal bath becomes particularly efficient. This distinctive transition behavior differentiates the HS model from other inflationary models and advances our understanding of DM production.
