Standard Model Background of the Cosmological Collider

TL;DR

This paper analyzes the Standard Model background signals in the Cosmological Collider framework, crucial for identifying new physics through primordial non-Gaussianities during inflation.

Contribution

It provides a detailed description of the Standard Model background signals relevant for the Cosmological Collider, aiding future searches for new physics.

Findings

Standard Model particles produce characteristic signals in primordial non-Gaussianities.

Understanding these background signals is essential for detecting new physics.

The paper clarifies the expected signals from known physics in the early universe.

Abstract

The inflationary universe can be viewed as a "Cosmological Collider" with energy of Hubble scale, producing very massive particles and recording their characteristic signals in primordial non-Gaussianities. To utilize this collider to explore any new physics at very high scales, it is a prerequisite to understand the background signals from the particle physics Standard Model. In this paper we describe the Standard Model background of the Cosmological Collider.