1 research outputs found
Geodetic precession and strong gravitational lensing in the dynamical Chern-Simons modified gravity
We have investigated the geodetic precession and the strong gravitational
lensing in the slowly-rotating black hole in the dynamical Chern-Simons
modified gravity theory. We present the formulas of the orbital period and
the geodetic precession angle for the timelike particles in the
circular orbits around the black hole, which shows that the change of the
geodetic precession angle with the Chern-Simons coupling parameter is
converse to the change of the orbital period with for fixed . We also
discuss the effects of the Chern-Simons coupling parameter on the strong
gravitational lensing when the light rays pass close to the black hole and
obtain that for the stronger Chern-Simons coupling the prograde photons may be
captured more easily, and conversely, the retrograde photons is harder to be
captured in the slowly-rotating black hole in the dynamical Chern-Simons
modified gravity. Supposing that the gravitational field of the supermassive
central object of the Galaxy can be described by this metric, we estimated the
numerical values of the main observables for gravitational lensing in the
strong field limit.Comment: 19 pages, 5 figures, more clarifications and references added,
accepted for publication in Classical and Quantum Gravit