Luís C. B. Crispino

Learn More
We analyze the scattering of a planar monochromatic electromagnetic wave incident upon a Schwarzschild black hole. We obtain accurate numerical results from the partial wave method for the electromagnetic scattering cross section and show that they are in excellent agreement with analytical approximations. The scattering of electromagnetic waves is compared(More)
Article history: Received 29 August 2017 Accepted 17 September 2017 Available online 25 September 2017 Editor: M. Trodden We calculate the absorption cross section for planar waves incident upon Kerr black holes, and present a unified picture for scalar, electromagnetic and gravitational waves. We highlight the spin-helicity effect that arises from a(More)
We study quantum gravitational perturbations in the static patch of de Sitter space. In particular, we determine the symplectic inner product of these perturbations and use it to write down the graviton two-point function in the state analogous to the Bunch-Davies vacuum in a certain gauge. We find this two-point function to be infrared-finite and(More)
Emanuele Berti∗,†, Vitor Cardoso∗,†,‡,§,¶, Luis C. B. Crispino§, Leonardo Gualtieri¶, Carlos Herdeiro‖,‡‡ and Ulrich Sperhake∗,∗∗,†† ∗Department of Physics and Astronomy, The University of Mississippi, University, MS 38677, USA †CENTRA, Departamento de F́ısica, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais 1, 1049 Lisboa, Portugal(More)
We investigate the low-frequency absorption cross section of the electromagnetic waves for the extreme Reissner-Nordström black holes in higher dimensions. We first construct the exact solutions to the relevant wave equations in the zero-frequency limit. In most cases it is possible to use these solutions to find the transmission coefficients of partial(More)
  • 1