Standard Model Background of the Cosmological Collider

TL;DR

The standard model background of the cosmological collider is described, a prerequisite to understand the background signals from the particle physics standard model to explore any new physics at very high scales.

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.

Figures (2)

• Figure 1: The mass spectrum of Standard Model during inflation. The left three columns correspond the non-Higgs inflation with zero Higgs VEV, and Higgs masses are chosen to be $(0.05,0.5,5)H$, respectively. The rightmost column corresponds to the original Higgs inflation model.
• Figure 2: The diagram contributing to the squeezed limit of the bispectrum with SM loop. The $\Phi$ field represents any of SM fields.