We study S4 flavor symmetric inverse seesaw model which has the possibility of simultaneously addressing neutrino phenomenology, dark matter (DM) and baryon asymmetry of the universe (BAU) through leptogenesis. The model is the extension of the standard model by the addition of two (RH) neutrinos and three sterile fermions leading to a keV scale sterile neutrino DM and two pairs of quasi-Dirac states. The CP violating decay of the lightest quasi-Dirac pair present in the model generates lepton asymmetry which then converts to BAU. Thus, this model can provide a simultaneous solution for nonzero neutrino mass, DM content of the universes and the observed baryon asymmetry. The S4 flavor symmetry in this model is augmented by additional Z4 × Z3 symmetry to constrain the Yukawa Lagrangian. A detailed numerical analysis has been carried out to obtain DM mass, DM-active mixing as well as BAU both for normal hierarchy as well as inverted hierarchy. We try to correlate the two cosmological observables and found a common parameter space satisfying the DM phenomenology and BAU. The parameter space of the model is further constrained from the latest cosmological bounds on the observables.

中文翻译：

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逆跷跷板框架中的中微子质量、轻质生成和不育中微子暗物质

我们学习小号4风味对称逆跷跷板模型，它有可能通过轻质发生同时解决中微子现象学、暗物质 (DM) 和宇宙重子不对称性 (BAU)。该模型是标准模型的扩展，添加了两个（RH）中微子和三个无菌费米子，形成了 keV 规模的无菌中微子 DM 和两对准狄拉克态。模型中存在的最轻的准狄拉克对的 CP 违反衰减产生轻子不对称性，然后转换为 BAU。因此，该模型可以同时解决非零中微子质量、宇宙的 DM 含量和观察到的重子不对称性。这小号4该模型中的风味对称性通过额外的增强Z4 × Z3限制 Yukawa Lagrangian 的对称性。已经进行了详细的数值分析以获得正常层次结构和倒置层次结构的 DM 质量、DM 主动混合以及 BAU。我们尝试将这两个宇宙学可观测量关联起来，并找到了一个满足 DM 现象学和 BAU 的共同参数空间。模型的参数空间进一步受限于可观测量的最新宇宙学界限。