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Paper: Constraining Gravitational Theories by Observing Magnetic White Dwarfs
Volume: 334, 14th European Workshop on White Dwarfs
Page: 265
Authors: Preuss, O.; Jordan, S.; Haugan, M.P.; Solanki, S.K.
Abstract: 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 k2 ≤ (22m)2.
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