Seminar is held on Tuesdays at 13:10 pm in the lecture room of the Institute
on the 10th floor of the department building at Trója, V Holešovičkách 2, Prague 8
I examine gravitational Faraday rotation in a general, model-agnostic spacetime introduced by Johannsen (2013). This spacetime is of Petrov type I and therefore lacks the Penrose–Walker constant. In contrast to the Kerr case—where the existence of the Penrose–Walker constant reduces the problem to a straightforward algebraic derivation—the absence of this constant requires a different approach. I construct a suitable tetrad at the critical photon orbit of the compact object described by these spacetimes and track the evolution of the polarization vector of null rays within this tetrad. By following the polarization through half an orbit around the central mass, I aim to quantify the resulting rotation and highlight how the loss of hidden symmetries modifies the polarization transport relative to the Kerr limit.
TBA
David Kubizňák Oldřich Semerák