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arXiv 2602.20570hep-ph
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作为非对称暗物质的无菌中微子

Sterile Neutrino as an Asymmetric Dark Matter

Yazd University(亚兹德大学)

S. Peyman Zakeri

AI总结:

提出通过冻结产生的不对称无菌中微子暗物质的最小框架,利用标量中介衰变产生无菌扇区粒子-反粒子不对称性,并满足结构形成和宇宙学约束。

摘要:

我们提出了一个最小且可预测的框架,用于通过冻结产生的不对称无菌中微子暗物质(DM)。标准模型(SM)扩展了一个携带守恒暗荷的规范单态狄拉克无菌中微子、一个实标量中介和一个辅助单态费米子。DM通过中介的非平衡衰变产生,同时通过CP破坏参数在无菌扇区产生粒子-反粒子不对称性。我们表明,观察到的遗迹丰度可以在不与SM等离子体热平衡的情况下自然重现。由此产生的非热动量分布比热费米-狄拉克谱更冷,确保与结构形成约束一致。结合遗迹密度、莱曼-α、希格斯不可见衰变和大爆炸核合成(BBN)界限,我们识别了参数空间中相关且可预测的区域,其特征是无菌中微子质量与衰变参数之间的非平凡关系。该场景在不对称冻结产生(AFI)框架内提供了狄拉克不对称无菌中微子暗物质的自洽实现,为传统产生机制提供了受限且可检验的替代方案。

英文摘要:

We propose a minimal and predictive framework for asymmetric sterile neutrino dark matter (DM) produced via freeze-in. The standard model (SM) is extended by a gauge-singlet Dirac sterile neutrino carrying a conserved dark charge, a real scalar mediator, and an auxiliary singlet fermion. DM is generated through the out-of-equilibrium decay of the mediator, which simultaneously produces a particle{antiparticle asymmetry in the sterile sector controlled by a CP-violating parameter. We show that the observed relic abundance can be naturally reproduced without thermal equilibration with the SM plasma. The resulting non-thermal momentum distribution is colder than a thermal Fermi{Dirac spectrum, ensuring consistency with structure formation constraints. Combining relic density, Lyman-α, Higgs invisible decay, and big bang nucleosynthesis (BBN) bounds, we identify correlated and predictive regions of the parameter space characterized by non-trivial relations among the sterile neutrino mass and the decay parameters. This scenario provides a self-consistent realization of Dirac asymmetric sterile neutrino DM within an asymmetric freeze-in (AFI) framework, offering a constrained and testable alternative to conventional production mechanisms.

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