New Directions in Gravity Searches for Spacetime-Symmetry breaking

TL;DR

This paper reviews recent advances in testing spacetime symmetries within gravitational physics, focusing on potential Lorentz and diffeomorphism violations, gravitational wave polarizations, and black hole solutions in symmetry-breaking models.

Contribution

It introduces new signals and theoretical predictions for symmetry violations, including multipole expansions and black hole solutions, expanding the scope of gravitational tests.

Findings

Predicted extra polarizations for gravitational waves.

Identified new signals for Lorentz and diffeomorphism violations.

Numerical results for black hole solutions in symmetry-breaking models.

Abstract

In this talk, we review recent results in testing spacetime symmetries in gravitational physics. Topics discussed include new signals for hypothetical Lorentz and diffeomorphism symmetry violations in short-range gravity tests. We review results for multipole expansions that predict extra polarizations for gravitational waves. Both explicit and spontaneous spacetime-symmetry breaking origins are considered. We also discuss recent numerical results for black hole solutions in a vector field model of spontaneous symmetry breaking.