论文标题
在伪DIRAC SINGLET DOUBLET方案中，对Seesaw的黑暗线索和（非）标准宇宙学
A dark clue to seesaw and leptogenesis in a pseudo-Dirac singlet doublet scenario with (non)standard cosmology
论文作者
论文摘要
我们提出了一个有吸引力的瘦素发生的替代方案，在黑暗部门的辅助下，导致宇宙的重子不对称，满足了所有理论和实验性约束。黑暗区域的单身双线式暗物质的非少量设置为真实的单线标量场的副本扩展。除了典型的狄拉克（Dirac）术语外，单身深色费米恩（Singlet Dark Fermion）的一个小小的Majorana质量术语还提供了伪DIRAC类型的更有利的暗物质，能够逃脱直接搜索。这种结构还为活跃的中微子质量提供了巨大的范围。在存在宇宙的（非）标准热历史的情况下，我们执行了采用合适的基准场景的详细暗物质现象学，与直接检测和中微子振荡数据一致。此外，我们已经证明了单线标量可以从平衡衰减中经过CP侵入，从而产生大量的Lepton不对称性。然后，由于此处考虑的替代宇宙学背景，这种不对称性通过非扰动的sphaleron过程转化为宇宙观察到的重子不对称。因此
We propose an appealing alternative scenario of leptogenesis assisted by dark sector which leads to the baryon asymmetry of the Universe satisfying all theoretical and experimental constraints. The dark sector carries a non minimal set up of singlet doublet fermionic dark matter extended with copies of a real singlet scalar field. A small Majorana mass term for the singlet dark fermion, in addition to the typical Dirac term, provides the more favourable dark matter of pseudo-Dirac type, capable of escaping the direct search. Such a construction also offers a formidable scope to radiative generation of active neutrino masses. In the presence of a (non)standard thermal history of the Universe, we perform the detailed dark matter phenomenology adopting the suitable benchmark scenarios, consistent with direct detection and neutrino oscillations data. Besides, we have demonstrated that the singlet scalars can go through CP-violating out of equilibrium decay, producing an ample amount of lepton asymmetry. Such an asymmetry then gets converted into the observed baryon asymmetry of the Universe through the non-perturbative sphaleron processes owing to the presence of the alternative cosmological background considered here. Unconventional thermal history of the Universe can thus aspire to lend a critical role both in the context of dark matter as well as in realizing baryogenesis
