Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2004-05-13
Phys.Rev. D70 (2004) 067101
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
Statements about Moffat's NGT modified. Accepted for publication in Phys.Rev.D
Scientific paper
10.1103/PhysRevD.70.067101
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 ${RE J0317-853}$ to set strong constraints on the essential coupling constant for this effect, giving $k^2 \lsim (19 {m})^2 $.
Haugan Mark P.
Jordan Stefan
Preuss Oliver
Solanki Sami K.
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