低再加热温度的再审视：冻结入与冻结出
A relook at a low reheating temperature: Freeze-in versus Freeze-out
浏览论文内容
中文总结 AI 辅助
本文重新审视低再加热温度对暗物质遗迹丰度的影响，指出关键尺度是主导产生过程的特征温度而非暗物质质量，并证明存在由质量谱决定的最小再加热温度，低于此温度冻结入与冻结出机制的遗迹丰度均降至极低。
中文摘要 AI 辅助
降低暴胀后再加热温度 $T_{\ m RH}$ 作为获得正确暗物质（DM）遗迹丰度的一种手段，已引起广泛关注。我们在暴胀子衰变本质上是瞬时的假设下重新审视这一范式，此时热浴仅在相对较低的温度下才形成。我们证明，与流行的误解相反，相关尺度不一定是暗物质质量本身，而是主导暗物质产生过程在热学上有效的特征温度。由于 $T_{\ m RH}$ 设定了热产生可用的最高温度，从而决定了产生历史中可达到的阶段，降低 $T_{\ m RH}$ 往往会导致遗迹丰度减少。虽然原则上这种效应可以通过改变定义理论的耦合常数来抵消，但存在一个由质量谱决定的最小 $T_{\ m RH}$，低于该温度，无论机制是冻结入还是冻结出，遗迹丰度都会降至极低水平。
英文摘要
A lowering of the post-inflation reheating temperature $T_{\rm RH}$ has attracted much attention as a means to facilitate obtaining the correct Dark Matter (DM) relic abundance. We take a relook at the paradigm under the assumption that the inflaton decay is essentially instantaneous, with the thermal bath coming into existence only at a relatively low temperature. We demonstrate that, contrary to the popular misconception, the relevant scale is not necessarily the DM mass itself, but the characteristic temperature at which the dominant DM production processes are thermally efficient. With $T_{\rm RH}$ setting the maximum temperature available for thermal production, and thereby determining the accessible stages of the production history, lowering $T_{\rm RH}$ tends to reduce the relic abundance. While this effect could, in principle, be offset by altering the couplings defining the theory, there exists a minimum $T_{\rm RH}$---determined by the mass spectrum---below which the relic abundance falls to minuscule levels, whether the mechanism be freeze-in or freeze-out.
发表机构
- University of Delhi（德里大学）
- Indian Institute of Technology Kanpur（坎普尔印度理工学院）
机构由 AI 辅助整理，请以论文原文为准。
