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4D Einstein-Gauss-Bonnet gravity: Massless particles and absorption of planar spin-0 waves
Haroldo C. D. Lima Junior, Carolina L. Benone, Luís C. B. Crispino
We investigate the absorption cross section of planar scalar massless waves impinging on spherically symmetric black holes which are solutions of the novel 4D Einstein-Gauss-Bonnet…
Electrically charged black holes in linear and nonlinear electrodynamics: Geodesic analysis and scalar absorption
Marco A. A. Paula, Luiz C. S. Leite, Luís C. B. Crispino
Along the last decades, several regular black hole (BH) solutions, i.e., singularity-free BHs, have been proposed and associated to nonlinear electrodynamics models minimally coupl…
Spinning black holes with a separable Hamilton-Jacobi equation from a modified Newman-Janis algorithm
Haroldo C. D. Lima Junior, Luís C. B. Crispino, Pedro V. P. Cunha +1
Obtaining solutions of the Einstein field equations describing spinning compact bodies is typically challenging. The Newman-Janis algorithm provides a procedure to obtain rotating…
Quantum superradiance on static black hole space-times
Visakan Balakumar, Rafael P. Bernar, Luis C. B. Crispino +1
We study the quantum analogue of the classical process of superradiance for a massless charged scalar field on a static charged black hole space-time. We show that an "in" vacuum s…
Synchrotron geodesic radiation in Schwarzschild-de Sitter spacetime
João P. B. Brito, Rafael P. Bernar, Luís C. B. Crispino
We analyze the scalar radiation emitted by a source in geodesic circular orbits around a Schwarzschild-de Sitter black hole. We obtain the emitted power using quantum field theory…
Analytical investigation of wave absorption by a rotating black hole analogue
Leandro A. Oliveira, Carolina L. Benone, Amanda L. Almeida +1
Perturbations in a draining vortex can be described analytically in terms of confluent Heun functions. In the context of analogue models of gravity in ideal fluids, we investigate…