Hot leptogenesis from thermal Dark Matter
Hot leptogenesis from thermal Dark Matter
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DOI：
10.1088/1475-7516/2017/10/042
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发表时间：
2017-07
影响因子：
6.4
通讯作者：
N. Bernal;C. S. Fong
中科院分区：
文献类型：
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作者：
N. Bernal;C. S. Fong
在这项工作中，我们研究了重马约拉纳右手中微子（RHNs）与温度高于标准模型（SM）热浴的暗扇区处于热平衡的情况。具体来说，我们考虑了热暗物质（DM）丰度从DM湮灭冻结到rhn是固定的情况。由于rhn的惰性性质，我们表明，通过拥有两代以上的rhn，这两个扇区可能保持热解耦。温度越高，DM和rhn的丰度越高，结果如下。对于细生，可以获得高达51.6倍的效率增强，尽管由于rhn的质量上限约为4 TeV，仍然需要CP违逆的共振增强。对于DM，要获得正确的DM丰度，需要增大湮灭截面至51.6倍。这种情况可以通过间接检测DM湮灭成RHNs， RHNs然后衰变成h ν， Z ν和W±r ν来探测，并且在典型热值以上增强湮灭截面。
In this work, we investigate a scenario in which heavy Majorana Right-Handed Neutrinos (RHNs) are in thermal equilibrium with a dark sector with temperature higher than the Standard Model (SM) thermal bath. Specifically, we consider the scenario in which thermal Dark Matter (DM) abundance is fixed from the freeze-out of DM annihilations into RHNs. Due to the inert nature of the RHNs, we show that it is possible for the two sectors to remain thermally decoupled by having more than two generations of the RHNs. The hotter temperature implies higher abundances of DM and RHNs with the following consequences. For leptogenesis, an enhancement in efficiency up to a factor of 51.6 can be obtained, though a resonant enhancement of CP violation is still required due to an upper mass bound of about 4 TeV for the RHNs. For the DM, an enhanced annihilation cross section up to a factor of 51.6 is required to obtain the correct DM abundance. This scenario can be probed via indirect detection of DM annihilating into RHNs, which then decay into h ν, Z ν and W± ℓ∓ with an enhanced annihilation cross section above the typical thermal value.