NANOGrav 邂逅 Hot New Early Dark Energy 与中微子质量的起源
NANOGrav meets Hot New Early Dark Energy and the origin of neutrino mass
AI总结：
本文研究 Hot NEDE 模型中伴随中微子质量产生的 GeV 尺度 UV 相变能否解释 NANOGrav 观测，探讨其作为暗区一阶相变信号的可能性。
摘要：
最近有推测认为，NANOGrav 观测指向了暗区在 GeV 尺度上的一阶相变 [1]。在此，我们表明这种相变可能已经在 Hot New Early Dark Energy 模型（Hot NEDE）[2],[3] 中被预言。在那里，论证了两次暗区相变是通过逆跷跷板机制产生中微子质量的标志。具体而言，一个 IR 相变具有双重目的：通过能量注入解决 Hubble 张力，并在逆跷跷板混合矩阵中产生 Majorana 质量项。这一通常的 NEDE 相变随后伴随着一个 UV 对应物，它在右手中微子的逆跷跷板质量矩阵中产生重 Dirac 质量项。在此，我们结合最近的 NANOGrav 观测，研究 Hot NEDE 模型的 UV 相变是否能在 GeV 尺度上发生。
英文摘要：
It has recently been speculated that the NANOGrav observations point towards a first-order phase transition in the dark sector at the GeV scale [1]. Here, we show that such a phase transition might already have been predicted in the Hot New Early Dark Energy model (Hot NEDE) [2],[3]. There, it was argued that two dark sector phase transitions are the signature of neutrino mass generation through the inverse seesaw mechanism. In particular, an IR phase transition serves a double purpose by resolving the Hubble tension through an energy injection and generating the Majorana mass entry in the inverse seesaw mixing matrix. This usual NEDE phase transition is then accompanied by a UV counterpart, which generates the heavy Dirac mass entry in the inverse seesaw mass matrix of a right-handed neutrino. Here, we investigate if the UV phase transition of the Hot NEDE model can occur at the GeV scale in view of the recent NANOGrav observations.
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