Observable gravitational waves in minimal scotogenic model
Observable gravitational waves in minimal scotogenic model
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DOI：
10.1088/1475-7516/2020/08/046
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发表时间：
2020-03
影响因子：
6.4
通讯作者：
D. Borah;A. Dasgupta;K. Fujikura;S. Kang;Devabrat Mahanta
中科院分区：
文献类型：
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作者：
D. Borah;A. Dasgupta;K. Fujikura;S. Kang;Devabrat Mahanta
我们从强一阶电弱相变（EWPT）和未来计划的空间实验中可观测到的引力波的要求出发，仔细研究了被广泛研究的暗物质（DM）和辐射中微子质量的最小scotogenic模型。标量DM场景类似于标准模型的惰性标量双重扩展，其中强一阶EWPT有利于DM的低质量区域的一部分，而最新的直接检测边界不支持。在费米子DM场景中，随着惰性标量重态中质量序限制的放宽，我们得到了有利于强一阶EWPT的新的参数空间区域。虽然这种亲轻子费米子DM在严格的直接检测范围内仍然是安全的，但新允许的带电标量的低质量范围可以在对撞机上留下诱人的特征，并且还可以在未来的实验中诱导带电轻子的味道破坏。在得到满足DM遗迹、具有可探测引力波的强一阶EWPT、轻中微子质量等约束条件的参数空间新区域的同时，我们还在类似模型的分析基础上进行了改进，在有效有限温度势中加入了适当的恢复效应。
We scrutinise the widely studied minimal scotogenic model of dark matter (DM) and radiative neutrino mass from the requirement of a strong first order electroweak phase transition (EWPT) and observable gravitational waves at future planned space based experiments. The scalar DM scenario is similar to inert scalar doublet extension of standard model where a strong first order EWPT favours a portion of the low mass regime of DM which is disfavoured by the latest direct detection bounds. In the fermion DM scenario, we get newer region of parameter space which favours strong first order EWPT as the restriction on mass ordering within inert scalar doublet gets relaxed. While such leptophilic fermion DM remains safe from stringent direct detection bounds, newly allowed low mass regime of charged scalar can leave tantalising signatures at colliders and can also induce charged lepton flavour violation within reach of future experiments. While we get such new region of parameter space satisfying DM relic, strong first order EWPT with detectable gravitational waves, light neutrino mass and other relevant constraints, we also improve upon previous analysis in similar model by incorporating appropriate resummation effects in effective finite temperature potential.