# Probing Primordial Symmetry Breaking with Cosmic Microwave Background Anisotropy

## TL;DR

This paper investigates how different primordial symmetry breaking scenarios influence CMB anisotropy, proposing methods to distinguish them through their unique effects on the CMB power spectra.

## Contribution

It introduces a novel approach to connect primordial symmetry breaking models with observable CMB anisotropies, comparing two specific models using their predicted power spectra.

## Key findings

- Different symmetry breaking models produce distinct CMB power spectra.
- Perturbation equations reveal differences rooted in symmetry properties.
- CMB observations can potentially verify types of primordial symmetry breaking.

## Abstract

There have been vigorous research attempts to test various modified gravity theories by usingphysics of the cosmic microwave background (CMB). Meanwhile, symmetry breaking such as Higgsmechanism is one of the most important phenomena in physics but there have been not so muchresearches to make them contact with cosmological observations. In this article, with the CMBpower spectra we try to distinguish two different scenarios of spontaneous symmetry breaking inprimordial era of the universe. The first model is based on a broken symmetric theory of gravity,which was suggested by A. Zee in 1979. The second model is an application of Palatini formalismto the first model. Perturbation equations are computed and they show differences originated fromthe property of symmetry. Furthermore, it turns out that two models have different features ofCMB power spectra with the same potential scale. This fact enables us to verify distinct kinds ofprimordial symmetry breaking with CMB physics.