Using three small-eccentricity relativistic binary pulsars, this paper obtains order-of-magnitude upper limits on SME matter-gravity coefficients for neutrons, protons, and electrons.
Combined search for Lorentz violation in short-range gravity
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abstract
Short-range experiments testing the gravitational inverse-square law at the submillimeter scale offer uniquely sensitive probes of Lorentz invariance. A combined analysis of results from the short-range gravity experiments HUST-2015, HUST-2011, IU-2012, and IU-2002 permits the first independent measurements of the 14 nonrelativistic coefficients for Lorentz violation in the pure-gravity sector at the level of $10^{-9}$ m$^2$, improving by an order of magnitude the sensitivity to numerous types of Lorentz violation involving quadratic curvature derivatives and curvature couplings.
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Lorentz-violating matter-gravity couplings in small-eccentricity binary pulsars
Using three small-eccentricity relativistic binary pulsars, this paper obtains order-of-magnitude upper limits on SME matter-gravity coefficients for neutrons, protons, and electrons.