标题： 宇宙非高斯性来自中微子跷跷板机制 显示英文标题

标题： Cosmological Non-Gaussianity from Neutrino Seesaw Mechanism

摘要： 通过常规跷跷板机制生成中微子质量是在大约$O(10^{14})$GeV 的高尺度上实现的，这使得测试中微子跷跷板机制成为一个巨大的挑战。 一个引人注目的事实是，中微子跷跷板尺度通常接近宇宙膨胀尺度。 在这项工作中，我们提出了一种框架，将膨胀和中微子跷跷板机制结合在一起，在这种框架中，膨胀子在膨胀后主要衰变为右手中微子。 这个衰变过程由膨胀子与尊重位移对称性的右手中微子的相互作用所支配。 通过中微子跷跷板机制，希格斯场的涨落可以调制膨胀子的衰变，从而对曲率扰动做出贡献。 我们研究了由此产生的非高斯信号，并证明这些信号提供了探测高尺度中微子跷跷板机制的重要手段。 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, making the test of neutrino seesaw 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. Through 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.