Lorentz Violation, Electrodynamics, and the Cosmic Microwave Background

TL;DR

This paper investigates potential Lorentz-symmetry violations through vacuum birefringence effects in the cosmic microwave background, using polarization data to set new constraints on such violations.

Contribution

It provides the first constraints on Lorentz violation in electrodynamics derived from cosmic microwave background polarization measurements.

Findings

No evidence of birefringence detected.

Stringent limits placed on Lorentz-violating parameters.

Enhances understanding of fundamental symmetries in physics.

Abstract

Vacuum birefringence is a signature of Lorentz-symmetry violation. Here we report on a recent search for birefringence in the cosmic microwave background. Polarization data is used to place constraints on certain forms of Lorentz violation.