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Massive vector fields in Kerr-Newman and Kerr-Sen black hole spacetimes
(2020-04-01)
The superradiant instability modes of ultralight massive vector bosons are studied for weakly charged rotating black holes in Einstein-Maxwell gravity (the Kerr- Newman solution) and low-energy heterotic string theory (the ...
A matrix method for quasinormal modes: Kerr and Kerr-Sen black holes
(World Scientific Publ Co Pte Ltd, 2017-08-20)
In this paper, a matrix method is employed to study the scalar quasinormal modes of Kerr as well as Kerr-Sen black holes. Discretization is applied to transfer the scalar perturbation equation into a matrix form eigenvalue ...
Comment on" Boosted Kerr black holes in general relativity"
(American Physical Society, 2020-01)
We discuss a recently presented boosted Kerr black hole solution which had already been used by other authors. This boosted metric is based on wrong assumptions regarding asymptotic inertial observers and moreover the ...
Bounds for axially symmetric linear perturbations for the extreme Kerr black hole
(IOP Publishing, 2015-06)
We obtain remarkably simple integral bounds for axially symmetric linear perturbations for the extreme Kerr black hole in terms of conserved energies. From these estimates we deduce pointwise bounds for the perturbations ...