New tests of local Lorentz invariance and local position invariance of gravity with pulsars

TL;DR

This paper uses precise pulsar timing data to set new stringent limits on potential deviations from local Lorentz and position invariance in gravity, improving our understanding of fundamental physics.

Contribution

It introduces novel tests using binary pulsar observations to constrain parameters indicating violations of local Lorentz and position invariance in gravity.

Findings

Constrained the parameter |;| < 3.1;4 (95% C.L.) for the first time.

Achieved high-precision bounds on (strong-field) parametrized post-Newtonian parameters.

Enhanced the experimental limits on deviations from general relativity.

Abstract

New tests are proposed to constrain possible deviations from local Lorentz invariance and local position invariance in the gravity sector. By using precise timing results of two binary pulsars, i.e., PSRs J1012+5307 and J1738+0333, we are able to constrain (strong-field) parametrized post-Newtonian parameters $\hat{\alpha}_1$, $\hat{\alpha}_2$, $\hat{\xi}$ to high precision, among which, $|\hat{\xi}| < 3.1\times10^{-4}$ (95% C.L.) is reported here for the first time.