标题： 防紫外线（自然）暴胀：原初涨落和非高斯特征 显示英文标题

标题： UV-protected (Natural) Inflation: Primordial Fluctuations and non-Gaussian Features

摘要： 我们考虑了紫外保护的暴胀模型，其中暴胀势能是通过全局对称性到离散对称性的量子（一环）破缺得到的。 在这个模型中，所有耦合尺度都是普朗克以下的。 这是通过将暴胀的动能项与爱因斯坦张量耦合来实现的，使得在高能量下摩擦力被引力增强。 在这方面，这种新的相互作用几乎使任何适合暴胀的势能都适用，同时保持系统的微扰单位性。 我们表明，即使引力增强的摩擦本身包含新的非线性，紫外保护的暴胀（以及任何类似模型）的行为就像一个场情景，具有红倾斜谱和潜在可探测的引力波。 有趣的是，我们发现局部形式的曲率扰动的非高斯性完全由从空间平坦规范到均匀场规范的非线性规范变换和/或暴胀子和规范玻色子的宇称破坏相互作用所主导。 特别是，宇称破坏的相互作用可能会产生可探测的非高斯性。 显示英文摘要

摘要： We consider the UV-protected inflation, where the inflaton potential is obtained by quantum (one-loop) breaking of a global symmetry into a discrete symmetry. In this model, all coupling scales are sub-Planckian. This is achieved by coupling the inflaton kinetic term to the Einstein tensor such that the friction is enhanced gravitationally at high energies. In this respect, this new interaction makes virtually any potential adequate for inflation while keeping the system perturbative unitary. We show that even if the gravitationally enhanced friction intrinsically contains new nonlinearities, the UV-protected inflation (and any similar models) behaves as a single field scenario with red tilted spectrum and potentially detectable gravitational waves. Interestingly enough, we find that non-Gaussianity of the curvature perturbations in the local form are completely dominated by the nonlinear gauge transformation from the spatially flat to uniform-field gauge and/or by parity violating interactions of the inflaton and gauge bosons. In particular, the parity violating interactions may produce detectable non-Gaussianity.