Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Tighter Test of Local Lorentz Invariance using PSR J2317+1439   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.

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The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: math-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-th
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The categories of this paper are: cs
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The categories of this paper are: alg-geom