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Lorentz symmetry is an important concept in modern physics. Precision pulsartiming was used to put tight constraints on the coefficients for Lorentzviolation in the pure-gravity sector of the Standard-Model Extension (SME). Weextend the analysis to Lorentz-violating matter-gravity couplings, utilizingthree small-eccentricity relativistic neutron star (NS) -- white dwarf (WD)binaries. We obtain compelling limits on various SME coefficients related tothe neutron, the proton, and the electron. These results are complementary tolimits obtained from lunar laser ranging and clock experiments.

Lorentz-violating matter-gravity couplings in small-eccentricity binary pulsars