Gravitational analog of Faraday rotation in the magnetized Kerr and Reissner-Nordström spacetimes

It is known that the gravitational analog of Faraday rotation arises in rotating spacetime due to nonzero gravitomagnetic field. In this paper, we show it also "nonrotating" Reissner-Nordstr\"om spacetime, if immersed a uniform magnetic The non-zero angular momentum (due presence electric charge and field) electromagnetic field acts as twist potential raise well Stern-Gerlach effect said spacetimes. twisting can still exist even mass vanishes. other words, massless charged particle(s) are able principle, responsible for plane polarization light. This, fact, could have applications basic physics models gravity. Here, study fields Kerr spacetimes, derive exact expressions magnetized Calculating lowest order arisen field, logarithm correction distance source observer spacetimes an important consequence From astrophysical point view, our result be helpful effects (gravito)magnetic on propagation polarized photons strong gravity regime collapsed object.