Exploring the CPT violation and birefringence of gravitational waves with ground- and space-based gravitational-wave interferometers

TL;DR

This paper investigates potential CPT violation and birefringence effects in gravitational waves, predicting waveform modifications and estimating how future detectors could constrain these phenomena.

Contribution

It introduces a model for CPT violation-induced birefringence in gravitational waves and assesses the sensitivity of current and future interferometers to these effects.

Findings

Predicted gravitational waveform modifications due to birefringence.

Estimated constraints on CPT violation from upcoming detectors.

Showed that space-based detectors could improve sensitivity.

Abstract

In the gravitational sector, we study the CPT violation and birefringence of gravitational waves. In presence of the CPT violation, a relative dephasing is generated between two circular polarization states of gravitational waves. This effect induces the birefringence of gravitational waves. We predict the gravitational waveform corrected by it and estimate the expected constraints on it from Advanced Laser Interferometer Gravitational-Wave Observatory, Einstein Telescope and Laser Interferometer Space Antenna.