arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2004.09511hep-phastro-ph.CO
收藏

左右理论中的无菌中微子暗物质

Sterile Neutrino Dark Matter in Left-Right Theories

Jeff A. Dror, David Dunsky, Lawrence J. Hall, Keisuke Harigaya

摘要:

$SU(2)_L \times SU(2)_R$规范对称性需要三个右手中微子($ N _i $),其中一个$N_1$可以足够稳定成为暗物质。在早期宇宙中,$ W _R $与标准模型热浴的交换使右手中微子在高温下保持热平衡。$N_1$可以构成所有的暗物质,如果它们在相对论性时冻结,并被随后的长寿命和更重的右手中微子$N_2$的衰变轻微稀释。我们系统地研究了这个参数空间,约束的对称性破缺规模的$SU(2)_R$和$N_1$的质量在$(v_R,M_1)$平面的三角形,与$v_R = (10^6 - 3 \times 10^{12})$ GeV和$M_1 = (2\, {\rm keV} - 1 \, {\rm MeV)}$。这个三角形的大部分可以通过温暖的暗物质的信号来探测,特别是如果$N_2$衰变产生的稀薄生成产生了观察到的重子不对称性。$v_R$的最小值增加到$10^8 \, {\rm GeV}$,用于$SU(2)_R$的双峰断裂,并且如果通过$N_2$衰变发生leptogenesis,则进一步增加到$10^9 \, {\rm GeV}$,而$M_1$的上限降低到100 keV。此外,还有一种由$N_2 \rightarrow N_1 \ell^+ \ell^-$晚期衰变产生的热$N_1$暗物质成分,可以通过未来的宇宙微波背景观测来探测。有趣的是,$v_R$的范围允许精确的规范耦合统一和希格斯宇称理解标准模型希格斯四次函数在$v_R$尺度上的消失。最后,我们研究了$N_1$暗物质通过$W_R$相互作用的冻结生产,这允许更广泛的$(v_R,M_1)$。

英文摘要:

$SU(2)_L \times SU(2)_R$ gauge symmetry requires three right-handed neutrinos ($ N _i $), one of which, $N_1$, can be sufficiently stable to be dark matter. In the early universe, $ W _R $ exchange with the Standard Model thermal bath keeps the right-handed neutrinos in thermal equilibrium at high temperatures. $N_1$ can make up all of dark matter if they freeze-out while relativistic and are mildly diluted by subsequent decays of a long-lived and heavier right-handed neutrino, $N_2$. We systematically study this parameter space, constraining the symmetry breaking scale of $SU(2)_R$ and the mass of $N_1$ to a triangle in the $(v_R,M_1)$ plane, with $v_R = (10^6 - 3 \times 10^{12})$ GeV and $M_1 = (2\, {\rm keV} - 1 \, {\rm MeV)}$. Much of this triangle can be probed by signals of warm dark matter, especially if leptogenesis from $N_2$ decay yields the observed baryon asymmetry. The minimal value of $v_R$ is increased to $10^8 \, {\rm GeV}$ for doublet breaking of $SU(2)_R$, and further to $10^9 \, {\rm GeV}$ if leptogenesis occurs via $N_2$ decay, while the upper bound on $M_1$ is reduced to 100 keV. In addition, there is a component of hot $N_1$ dark matter resulting from the late decay of $N_2 \rightarrow N_1 \ell^+ \ell^-$ that can be probed by future cosmic microwave background observations. Interestingly, the range of $v_R$ allows both precision gauge coupling unification and the Higgs Parity understanding of the vanishing of the Standard Model Higgs quartic at scale $v_R$. Finally, we study freeze-in production of $N_1$ dark matter via the $W_R$ interaction, which allows a much wider range of $(v_R,M_1)$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑