Charged particle and epicyclic motions around 4 D EinsteinGaussBonnet black hole immersed in an external magnetic field
Abstract
We investigate particle motion in the vicinity of a 4 D EinsteinGaussBonnet (EGB) black hole immersed in external asymptotically uniform magnetic field. It is well known that magnetic fields can strongly affect charged particle motion in the black hole vicinity due to the Lorenz force. We find that the presence of the GaussBonnet (GB) coupling gives rise to a similar effect, reducing the radius of the innermost stable circular orbit (ISCO) with respect to the purely relativistic Schwarzschild black hole. Further, we consider particle collisions in the black hole vicinity to determine the center of mass energy and show that this energy increases with respect to the Schwarzschild case due to the effect of the GB term. Finally, we consider epicyclic motion and its frequencies and resonance as a mean to test the predictions of the model against astrophysical observations. In particular we test which values of the parameters of the theory best fit the 3:2 resonance of highfrequency quasiperiodic oscillations in three lowmass Xray binaries.
 Publication:

Physics of the Dark Universe
 Pub Date:
 December 2020
 DOI:
 10.1016/j.dark.2020.100648
 arXiv:
 arXiv:2005.12410
 Bibcode:
 2020PDU....3000648S
 Keywords:

 General Relativity and Quantum Cosmology
 EPrint:
 36 pages, 8 figures, 1 table