# Pulsar tests of the gravitational Lorentz violation

## TL;DR

This paper uses pulsar timing data to test for tiny deviations from Einstein's General Relativity, focusing on Lorentz violation within the Standard-Model Extension framework, and finds no evidence of such deviations.

## Contribution

It systematically searches for Lorentz-violating operators in gravitational interactions using pulsar data, covering multiple mass dimensions and symmetries, which is a novel comprehensive test.

## Key findings

- No deviation from General Relativity detected
- Constraints placed on Lorentz-violating operators in gravity
- Supports the validity of Einstein's theory at tested scales

## Abstract

Pulsars are precision celestial clocks. When being put in a binary, the ticking conveys the secret of underlying spacetime geometrodynamics. We use pulsars to test if the gravitational interaction possesses a tiny deviation from Einstein's General Relativity (GR). In the framework of Standard-Model Extension (SME), we systematically search for Lorentz-violating operators cataloged by (a) the minimal couplings of mass dimension 4, (b) the CPT symmetry of mass dimension 5, and (c) the gravitational weak equivalence principle (GWEP) of mass dimension 8. No deviation from GR was found yet.