Scalar clouds around Kerr-Sen black holes
Abstract
In this paper, the behaviour of a charged massive scalar test field in the background of a Kerr-Sen black hole is investigated. A kind of stationary solutions, dubbed scalar clouds, are obtained numerically and expressed by the existence lines in the parameter space. We show that for fixed background and a given set of harmonic indices, the mass and charge of the scalar clouds are limited in a finite region in the parameter space of the scalar field. Particularly, the maximum values of the mass and charge of the clouds around extremal Kerr-Sen black holes are independent of the angular velocity of the black hole, whereas those in the extremal Kerr-Newman background depend on the angular velocity. In addition, it is demonstrated that, as the static limit of Kerr-Sen black hole, Gibbons-Maeda-Garfinkle-Horowitz-Strominger black hole can not support scalar cloud.
Cite
@article{arxiv.1706.04441,
title = {Scalar clouds around Kerr-Sen black holes},
author = {Yang Huang and Dao-Jun Liu and Xiang-Hua Zhai and Xin-Zhou Li},
journal= {arXiv preprint arXiv:1706.04441},
year = {2017}
}
Comments
15 pages, 7 figures, accepted for publication in Class. Quantum Grav