论文标题
中微子暗物质和希格斯门户：改进的冻结分析
Neutrino dark matter and the Higgs portal: improved freeze-in analysis
论文作者
论文摘要
无菌中微子是领先的暗物质候选者之一。它们的质量可能来自标量场的真空期望值。如果无菌中微子的耦合非常小，而Lepton数字对称性则禁止其直接耦合到Efflaton，则领先的暗物质生产机制是冻结中的场景。我们研究了基于Bose-Einstein统计，热量和相变效应的相对论生产率，我们研究了中微子质量范围高达1 GEV的可能性。生产机制和主导模式的细节取决于标量和无菌中微子质量之间的关系以及标量是否被热化。我们发现，在所有考虑的情况下都可以产生观察到的暗物质丰度。我们还重新审视了希格斯门户标量标量的冻结产生，指出了融合模式的重要性以及热限制。
Sterile neutrinos are one of the leading dark matter candidates. Their masses may originate from a vacuum expectation value of a scalar field. If the sterile neutrino couplings are very small and their direct coupling to the inflaton is forbidden by the lepton number symmetry, the leading dark matter production mechanism is the freeze-in scenario. We study this possibility in the neutrino mass range up to 1 GeV, taking into account relativistic production rates based on the Bose-Einstein statistics, thermal masses and phase transition effects. The specifics of the production mechanism and the dominant mode depend on the relation between the scalar and sterile neutrino masses as well as on whether or not the scalar is thermalized. We find that the observed dark matter abundance can be produced in all of the cases considered. We also revisit the freeze-in production of a Higgs portal scalar, pointing out the importance of a fusion mode, as well as the thermalization constraints.
