Quantum Standard Clocks in the Primordial Trispectrum
High Energy Physics - Theory
2018-05-22 v2 Cosmology and Nongalactic Astrophysics
High Energy Physics - Phenomenology
Abstract
We calculate the primordial trispectrum of curvature perturbation in quasi-single field inflation, with general sound speeds for both the inflaton and the massive scalar. Special attention is paid to various soft limits of the trispectrum, where the shape function shows characteristic oscillatory pattern (known as the quantum primordial standard clock signal) as a function of the momentum ratio. Our calculation is greatly simplified by using the "mixed propagator" developed under a diagrammatic representation of the in-in formalism.
Cite
@article{arxiv.1803.04412,
title = {Quantum Standard Clocks in the Primordial Trispectrum},
author = {Xingang Chen and Wan Zhen Chua and Yuxun Guo and Yi Wang and Zhong-Zhi Xianyu and Tianyou Xie},
journal= {arXiv preprint arXiv:1803.04412},
year = {2018}
}
Comments
23 pages, JCAP accepted version