引力子交换的暴胀三谱
Inflationary trispectrum from graviton exchange
摘要：
我们用标准动力学项计算暴胀过程中产生的原初曲率微扰的连通四点关联函数，其中关联是通过两对标量涨落之间交换引力子建立的.任何这样的相关产生的贡献的标量三谱的数量级的张量标量比r。这个贡献在数值上比以前计算的标量扰动在一个点上相互作用的基础上大一个数量级，并满足一个简单的极限关系，其中交换的引力子的动量变得比外部动量小得多。我们的结论是，总的非线性参数产生的单场模型的慢卷暴胀是在最大的τ NL ~ r。
英文摘要：
We compute the connected four-point correlation function of the primordial curvature perturbation generated during inflation with standard kinetic terms, where the correlation is established via exchange of a graviton between two pairs of scalar fluctuations. Any such correlation yields a contribution to the scalar trispectrum of the order of the tensor to scalar ratio r. This contribution is numerically one order of magnitude larger than the one previously calculated on the basis of scalar perturbations interacting at a point and satisfies a simple relation in the limit where the momentum of the graviton which is exchanged becomes much smaller than the external momenta. We conclude that the total non-linearity parameter generated by single-field models of slow-roll inflation is at maximum tauNL ~ r.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
