论文标题
轴心辅助共振振荡挽救了Dodelson-Widrow机制
Axion-assisted Resonance Oscillation Rescues the Dodelson-Widrow Mechanism
论文作者
论文摘要
$ \ rm {kev} $比例无菌中微子是多尔森 - 维德罗机构中暗物质颗粒的合格候选者。但是，需要提供足够数量的暗物质的混合角与天体物理观测矛盾。为了减轻这种张力，我们引入了有效的交互作用，即$ g_a（ϕ/λ）\partial_μa\ edrine {ν_α}γ^γ^μγ_5ν_α$，在标准模型中微子$ν_α$之中轴向矢量相互作用形式由轴突移位对称性确定，并引入具有动态真空期望值的单元$ ϕ $，以增强轴向矢量耦合强度并逃避严格的中性振荡约束。新相互作用产生的有效势可以取消} SM对应物，从而导致{增强的转换}概率在SM中微子和无菌中微子之间。因此，与DW机制相比，无菌中微子的产量可以大大增加。
The $\rm{keV}$ scale sterile neutrino was a qualified candidate for dark matter particles in the Dodelson-Widrow mechanism. But the mixing angle, needed to provide enough amount of dark matter, is in contradiction with the astrophysical observations. To alleviate such tension, we introduce an effective interaction, i.e. $g_a (ϕ/Λ)\partial_μa \overline{ν_α}γ^μ γ_5 ν_α$, among Standard Model neutrino $ν_α$, axion $a$, and singlet $ϕ$. The axial-vector interaction form is determined by the axion shift symmetry, and the singlet $ϕ$ with dynamically varied vacuum expectation value is introduced to reinforce the axial-vector coupling strength and evade the stringent neutrino oscillation constraints. The effective potential generated by the new interaction {could cancel} the SM counterpart, resulting in an {enhanced converting} probability between SM neutrino and sterile neutrino. Hence, the production rate of sterile neutrinos can be substantially enlarged with smaller mixing compared to the DW mechanism.
