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arxiv: astro-ph/0411688 · v1 · submitted 2004-11-25 · 🌌 astro-ph

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Constraining Gravitational Theories by Observing Magnetic White Dwarfs

Oliver Preuss (1) , Stefan Jordan (2) , Mark P. Haugan (3) , Sami K. Solanki (1) ((1) Max-Planck-Institut f\"ur Sonnensystemforschung , Katlenburg-Lindau , Germany , (2) Astronomisches Rechen-Institut , Heidelberg
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(3) Department of Physics West Lafayette Indiana USA)
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classification 🌌 astro-ph
keywords couplinggravitationalmagneticwhiteassumptionastrophysicalbirefringentconstant
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Under the assumption of a specific nonminimal coupling of torsion to Under the assumption of a specific nonminimal coupling of torsion to electromagnetism, spacetime is birefringent in the presence of a gravitational field leading to depolarization of light emitted from extended astrophysical sources. We use polarimetric data of the magnetic white dwarf RE J0317-853 to set for the very first time constraints on the essential coupling constant for this effect, giving k^2 <22 m^2. electromagnetism, spacetime is birefringent in the presence of a gravitational field leading to depolarization of light emitted from extended astrophysical sources. We use polarimetric data of the magnetic white dwarf RE J0317-853 to set for the very first time constraints on the essential coupling constant for this effect, giving k^2 <22 m^2.

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