Signatures of Modified Dispersion Relation of Graviton in the Cosmic Microwave Background

TL;DR

This paper explores how modifications to the graviton's dispersion relation could influence the CMB's B-mode polarization, providing a way to test quantum gravity effects at extremely low energy scales.

Contribution

It introduces a method to detect signatures of modified graviton dispersion relations through CMB polarization measurements.

Findings

Modified dispersion relation affects CMB B-mode polarization

Potential to test quantum gravity effects at very low energies

Provides constraints on graviton properties from cosmological data

Abstract

The dispersion relation of graviton is a fundamental issue for fundamental physics about gravity. In this paper we investigate how the modified dispersion relation of graviton affects the cosmic microwave background (CMB) power spectra, in particular the B-mode polarization. Our results will be useful to test the dispersion relation of graviton at the energy scale around $10^{-29}$ eV.