# Thermal Loop Effects on Large-Scale Curvature Perturbation in the Higgs Inflation

## TL;DR

This paper investigates how finite-temperature loop corrections in Higgs inflation can suppress large-scale curvature perturbations, potentially explaining the low quadrupole observed in the cosmic microwave background.

## Contribution

It introduces the analysis of thermal loop effects on curvature perturbations during Higgs inflation, highlighting their impact on large-scale anisotropies.

## Key findings

- Thermal loop effects suppress the power of curvature perturbations at large scales.
- Suppression leads to a lower quadrupole in the CMB temperature anisotropy.
- Finite temperature corrections are significant in Higgs inflation models.

## Abstract

It is known that the Higgs potential in the Standard Model can drive a successful inflation as long as the Higgs field couples non-minimally to gravity. It is then inevitable to take into account the loop corrections of the Standard Model particles to the Higgs potential in the Higgs inflation. In this paper, we discuss the one-loop corrections at finite temperature to the curvature perturbation generated during the Higgs inflation. We find that the thermal loop effects can suppress the power of the curvature perturbation at large scales, thus resulting in a low quadrupole of the temperature anisotropy in the cosmic microwave background.