论文标题
可观察的$ {\rmδ{n_ {eff}}}} $
Observable ${\rm Δ{N_{eff}}}$ in Dirac Scotogenic Model
论文作者
论文摘要
我们研究了探测辐射迪拉克透明模型的可能性，这些模型在循环内部传播，通过测量有效的相对论自由度$ {\rmΔ{\rmΔ{n_ {aff}}} $ at cosmic microwave（cmbb）的实验。中微子质量产生涉及的环路抑制和其他免费参数允许大（$ \ sim \ Mathcal {o}（1））$将光狄拉克中微子与深色扇形颗粒耦合。如此大的Yukawa耦合不仅决定了沉重的费米昂单线暗物质的丰富性，而且还可以导致迪拉克中微子的右手性部分的热量，从而产生了其他相对论的自由度$ {\rmδ{n_ {eff}}} $。我们发现，还可以通过$ {\rmδ{n_ {eff}}} $在未来的宇宙微波背景实验（例如CMB-S4）（例如CMB-S4）等未来的宇宙微波背景实验（例如CMB-S4）进行探测与暗物质现象学和中微子质量边界一致的参数空间。相同的参数空间虽然导致循环抑制的直接检测到未来敏感性之外的暗物质，但还可以通过带电的Lepton侵犯和对撞机的特征来具有其他有趣且互补的观察前景。
We study the possibility of probing the radiative Dirac seesaw model with dark sector particles going inside the loop, popularly referred to as the Dirac scotogenic model via measurements of effective relativistic degrees of freedom ${\rm Δ{N_{eff}}}$ at cosmic microwave background (CMB) experiments. The loop suppression and additional free parameters involved in neutrino mass generation allow large ($\sim\mathcal{O}(1))$ coupling of light Dirac neutrinos with the dark sector particles. Such large Yukawa coupling not only dictates the relic abundance of heavy fermion singlet dark matter but also can lead to the thermalisation of the right chiral part of Dirac neutrinos, generating additional relativistic degrees of freedom ${\rm Δ{N_{eff}}}$. We find that the parameter space consistent with dark matter phenomenology and neutrino mass bounds can also be probed at future cosmic microwave background experiments like CMB-S4 via precision measurements of ${\rm Δ{N_{eff}}}$. The same parameter space, while leading to loop-suppressed direct detection cross-section of dark matter outside future sensitivities, can also have other interesting and complementary observational prospects via charged lepton flavour violation and collider signatures.
