Solar constraints on new couplings between electromagnetism and gravity

Details Solar constraints on new couplings between electromagnetism and gravity Solar constraints on new couplings between electromagnetism and gravity

2004-02-12

arxiv.org/abs/gr-qc/0402055v1

Phys.Rev. D69 (2004) 062001

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Accepted for publication in Phys.Rev. D

Scientific paper

10.1103/PhysRevD.69.062001

The unification of quantum field theory and general relativity is a fundamental goal of modern physics. In many cases, theoretical efforts to achieve this goal introduce auxiliary gravitational fields, ones in addition to the familiar symmetric second-rank tensor potential of general relativity, and lead to nonmetric theories because of direct couplings between these auxiliary fields and matter. Here, we consider an example of a metric-affine gauge theory of gravity in which torsion couples nonminimally to the electromagnetic field. This coupling causes a phase difference to accumulate between different polarization states of light as they propagate through the metric-affine gravitational field. Solar spectropolarimetric observations are reported and used to set strong constraints on the relevant coupling constant k: k^2 < (2.5 km)^2.

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