AI 中文总结
介绍跷跷板再加热情景，暴胀子能量转移到长寿命中间标量粒子，其动力学决定再加热温度。推导解析解揭示相关特征，给出再加热温度表达式，该框架还能联系中微子质量起源与无中微子暗物质。
AI 中文摘要
我们引入了跷跷板再加热情景，其中暴胀子在宇宙通过其衰变成右手型中微子再加热之前，将其能量转移到与轻子数自发破缺相关的长寿命中间标量粒子上。结果，再加热温度不再由暴胀子衰变宽度决定，而是由跷跷板部分的动力学决定。我们推导了描述完整再加热历史的解析解，揭示了该情景的两个特征：中间标量粒子的相对论时间膨胀，抑制了其衰变并延迟了能量向热浴的转移；以及它随后从相对论到非相对论 regime 的转变，在热历史中引入了一个新的特征时间尺度。这些效应共同导致了再加热温度的简单解析表达式。当中间标量粒子被确定为负责轻子数自发破缺的场时，同一框架自然地将再加热温度与中微子质量的起源联系起来，并为无中微子暗物质提供了一个有充分动机的设定。
英文摘要
We introduce the Seesaw Reheating scenario, in which the inflaton transfers its energy to a long-lived intermediate scalar associated with the spontaneous breaking of lepton number before the Universe is reheated through its decay into right-handed neutrinos. As a result, the reheating temperature is no longer determined by the inflaton decay width but by the dynamics of the seesaw sector. We derive analytical solutions describing the complete reheating history, revealing two characteristic features of this scenario: the relativistic time dilation of the intermediate scalar, which suppresses its decay and delays the transfer of energy to the thermal bath, and its subsequent transition from a relativistic to a non-relativistic regime, introducing a new characteristic timescale in the thermal history. Together, these effects lead to simple analytical expressions for the reheating temperature. When the intermediate scalar is identified with the field responsible for the spontaneous breaking of lepton number, the same framework naturally connects the reheating temperature to the origin of neutrino masses and provides a well-motivated setting for sterile-neutrino dark matter.
Comments5 pages, 1 figure. Improved treatment of the thermal dilution factor, leading to an updated relic-abundance calculation and revised figures. The main conclusions remain unchanged
