A Tighter Test of Local Lorentz Invariance using PSR J2317+1439

Abstract

Gravity being a long-range force, one might {\it a priori} expect the Universe's global matter distribution to select a preferred rest frame for local gravitational physics. The phenomenology of preferred-frame effects, in the strong-gravitational field context of binary pulsars, is described by two parameters ${\hat{\alpha }}_1$ and ${\hat{\alpha }}_2$. These parameters vanish identically in general relativity, and reduce, in the weak-field limit, to the two parametrized post-Newtonian (PPN) parameters ${\alpha }_1$ and ${\alpha }_2$. We derive a limit of $|{\hat{\alpha }}_1|<1.7\times 10^{-4}$ (90\%~C.L.) using the very low eccentricity binary pulsar PSR J2317+1439, improving by a factor of 3 on previous limits.

arXiv comment4 pages, LaTeX, requires aaspp4.sty and flushrt.sty, submitted to ApJ

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