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GR: Fachverband Gravitation und Relativitätstheorie
GR 1: Black Holes
GR 1.5: Talk
Monday, March 21, 2022, 10:20–10:40, GR-H2
Black hole temperature in Horndeski gravity — •Kamal Hajian1, Stefano Liberati2, Mohammad Mehdi Sheikh-Jabbari3, and Mohammad Hasan Vahidinia4 — 1Carl von Ossietzky University of Oldenburg Department of Physics D-26111 Oldenburg — 23SISSA, Via Bonomea 265, 34136 Trieste, Italy and INFN, Sezione di Trieste — 35School of Physics, Institute for Research in Fundamental Sciences (IPM), P.O.Box 19395-5531, Tehran, Iran — 4Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), P.O. Box 45137-66731, Zanjan, Iran
In Horndeski gravities, which are the most generic scalar-tensor theories without ghosts, the speed of graviton can be different w.r.t other massless particles/waves such as photons. We will show that this leads to a black hole temperature which is different from the standard Hawking temperature by an overall factor. The factor depends on black hole properties as well as the Lagrangian. Using this modified temperature, the first law of thermodynamics for black holes in Horndeski gravities is recovered.