Double Binary Pulsar Test of Dynamical Chern-Simons Modified Gravity

Details Double Binary Pulsar Test of Dynamical Chern-Simons Modified Gravity Double Binary Pulsar Test of Dynamical Chern-Simons Modified Gravity

2008-10-30

arxiv.org/abs/0810.5541v2

Phys.Rev.D80:042004,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Rewritten and extended for Phys. Rev. D. Replaced with accepted version

Scientific paper

10.1103/PhysRevD.80.042004

Chern-Simons modified gravity is a string-theory and loop-quantum-gravity inspired effective theory that modifies General Relativity by adding a parity-violating Pontryagin density to the Einstein-Hilbert action multiplied by a coupling scalar. We strongly constrain non-dynamical Chern-Simons modified gravity with a timelike Chern-Simons scalar through observations of the double binary pulsar PSR J0737-3039A/B. We first calculate Chern-Simons corrections to the orbital evolution of binary systems. We find that the ratio of the correction to periastron precession to the general relativistic prediction scales quadratically with the semi-major axis and inversely with the square of the object's radius. Binary pulsar systems are thus ideal to test this theory, since periastron precession can be measured with sub-degree accuracies and the semi-major axis is millions of times larger than the stellar radius. Using data from PSR J0737-3039A/B we dramatically constrain the non-dynamical Chern-Simons coupling to $M_{\CS} := 1/|\dot{\vartheta}| > 33 {\textrm{meV}}$, approximately a hundred billion times better than current Solar System tests.

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