标题： 宇宙学非高斯性来自中微子跷跷板 显示英文标题

标题： Cosmological Non-Gaussianity from Neutrino Seesaw

摘要： 通过传统跷跷板机制生成中微子质量是在大约$O(10^{14})$GeV 的高能标下实现的，探测跷跷板能标的新的物理现象是一个巨大的挑战。 一个显著的事实是，中微子跷跷板能标通常与宇宙暴胀能标相当。 在本工作中，我们提出一个框架，将暴胀和中微子跷跷板机制结合起来，在该框架中，暴胀场在暴胀后主要衰变为右手中微子。 这一衰变过程由暴胀场与右手中微子之间的相互作用所支配，该相互作用尊重位移对称性。 在中微子跷跷板机制下，希格斯场的涨落可以调制暴胀场的衰变，从而对曲率扰动做出贡献。 我们研究了诱导的非高斯特征，并证明这种特征提供了一种重要的方法来探测高能标的中微子跷跷板机制。 显示英文摘要

摘要： The neutrino mass generation via conventional seesaw mechanism is realized at high scales around $O(10^{14})$GeV and probing new physics of the seesaw scale poses a great challenge. A striking fact is that the neutrino seesaw scale is typically around the cosmological inflation scale. In this work, we propose a framework incorporating inflation and neutrino seesaw in which the inflaton primarily decays into right-handed neutrinos after inflation. This decay process is governed by the inflaton interaction with the right-handed neutrinos that respects the shift symmetry. Under the neutrino seesaw mechanism, fluctuations of the Higgs field can modulate the inflaton decays, contributing to the curvature perturbation. We investigate the induced non-Gaussian signatures and demonstrate that such signatures provides an important means to probe the high-scale neutrino seesaw mechanism.