Constraints on non-minimally coupled curved space electrodynamics from astrophysical observations

Details Constraints on non-minimally coupled curved space electrodynamics from astrophysical observations Constraints on non-minimally coupled curved space electrodynamics from astrophysical observations

2003-06-05

arxiv.org/abs/gr-qc/0306021v1

Class.Quant.Grav. 20 (2003) 3023-3028

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

9 pages latex, accepted in CQG

Scientific paper

10.1088/0264-9381/20/14/304

We study interactions of electro-magnetic fields with the curvature tensor of the form $\lambda R_{\mu \nu \alpha \beta}F^{\mu \nu}F^{\alpha \beta}$. Such coupling terms though are invariant under general coordinate transformation and CPT, however violate the Einstein equivalence principle. These couplings do not cause any energy dependent dispersion of photons but they exhibit birefringence. We put constraints on the coupling constant $\lambda$ using results from solar system radar ranging experiments and millisecond-pulsar observations. We find that the most stringent constraint comes from pulsar observations and is given by $ \lambda < 10^{11} cm^2 $ obtained from the timing of binary pulsar PSR B1534+12.

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