An angular rainbow of light from curved spacetime
arXiv:2201.00224 · doi:10.1016/j.physleta.2021.127915
Abstract
We try to go beyond the geometrical optics approximation, by showing that a massless polarized particle allows a wide class of non minimal interactions with an arbitrary gravitational field. One specific example of a curvature-dependent interaction is presented, that results in a frequency-dependent Faraday effect. Even in a Schwarzschild spacetime, this leads to the angular dispersion of polarization planes for a linearly-polarized beam of waves with different frequencies, propagating along the same ray.
arXiv comment04 pages, Phys. Lett. A, published version. arXiv admin note: substantial text overlap with arXiv:2103.07794
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