An astronomical search for evidence of new physics: Limits on gravity-induced birefringence from the magnetic white dwarf RE J0317-853
arXiv:gr-qc/0405068 · doi:10.1103/PhysRevD.70.067101
Abstract
The coupling of the electromagnetic field directly with gravitational gauge fields leads to new physical effects that can be tested using astronomical data. Here we consider a particular case for closer scrutiny, a specific nonminimal coupling of torsion to electromagnetism, which enters into a metric-affine geometry of space-time. We show that under the assumption of this nonminimal coupling, spacetime is birefringent in the presence of such a gravitational field. This leads to the depolarization of light emitted from extended astrophysical sources. We use polarimetric data of the magnetic white dwarf to set strong constraints on the essential coupling constant for this effect, giving $k^2 \lsim (19 {m})^2 $.
Statements about Moffat's NGT modified. Accepted for publication in Phys.Rev.D
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