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Stationary bound states of massless scalar fields around black holes and black hole analogues

2015; World Scientific; Volume: 24; Issue: 09 Linguagem: Inglês

10.1142/s0218271815420183

1793-6594

Carolina L. Benone, Luís C. B. Crispino, Carlos Herdeiro, Eugen Radu,

Cosmology and Gravitation Theories

We discuss stationary bound states, a.k.a. clouds, for a massless test scalar field around Kerr black holes (BHs) and spinning acoustic BH analogues. In view of the absence of a mass term, the trapping is achieved via enclosing the BH — scalar field system in a cavity and imposing Dirichlet or Neumann boundary conditions. We discuss the variation of these bounds states with the discrete parameters that label them, as well as their spatial distribution, complementing results in our previous work [C. L. Benone, L. C. B. Crispino, C. Herdeiro and E. Radu, Phys. Rev. D91 (2015) 104038].