title: Strong binary pulsar constraints on Lorentz violation in gravity.
abstract: Binary pulsars are excellent laboratories to test the building blocks of Einstein's theory of general relativity. One of these is Lorentz symmetry, which states that physical phenomena appear the same for all inertially moving observers. We study the effect of violations of Lorentz symmetry in the orbital evolution of binary pulsars and find that it induces a much more rapid decay of the binary's orbital period due to the emission of dipolar radiation. The absence of such behavior in recent observations allows us to place the most stringent constraints on Lorentz violation in gravity, thus verifying one of the cornerstones of Einstein's theory much more accurately than any previous gravitational observation.
authors.affiliation: Department of Physics, Montana State University, Bozeman, Montana 59717, USA.
authors.forename: Kent
authors.initials: K
authors.lastname: Yagi
authors.affiliation: CERN, Theory Division, 1211 Geneva, Switzerland.
authors.forename: Diego
authors.initials: D
authors.lastname: Blas
authors.affiliation: Department of Physics, Montana State University, Bozeman, Montana 59717, USA.
authors.forename: Nicolás
authors.initials: N
authors.lastname: Yunes
authors.affiliation: CNRS, UMR 7095, Institut d'Astrophysique de Paris, 98bis Boulevard Arago, 75014 Paris, France and Sorbonne Universités, UPMC Univ Paris 06, UMR 7095, 98bis Boulevard Arago, 75014 Paris, France.
authors.forename: Enrico
authors.initials: E
authors.lastname: Barausse