论文标题
冻结和冷冻无菌中微子暗物质
Freeze-in and freeze-out of sterile neutrino dark matter
论文作者
论文摘要
带有KEV规模的无菌中微子是一个引人注目的候选暗物质。我们提出了一种新的生产机制，涉及具有HIGGS门户耦合的复杂标量单元的衰减和an灭，该耦合会形成真空期望值。所得的伪nambu-goldstone玻色子的相互作用可能会使黑暗扇区置换。我们确定到达黑暗扇区热化的参数空间区域，并讨论最相关的宇宙学观察力。该方案可以被视为黑暗区域的冻结，然后是相对论冻结的组合。
A sterile neutrino with a keV-scale mass is a compelling dark matter candidate. We propose a new production mechanism involving the decay and annihilation of a complex scalar singlet with a Higgs portal coupling which develops a vacuum expectation value. The interactions of the resulting pseudo Nambu-Goldstone boson may thermalise the dark sector. We determine the region of parameter space where dark sector thermalisation is reached and discuss the most relevant cosmological observables. The scenario can be considered as the combination of a freeze-in of the dark sector followed by relativistic freeze-out.
