50 citations · 297 across the 14 of their papers we have counts for
14 papers
Superabsorbing metamaterial wormhole: Physical modeling and wave interaction effects
Stanislav I. Maslovski, Hugo R. L. Ferreira, Iurii O. Medvedev +1
Conjugate-impedance matched superabsorbers are metamaterial bodies whose effective absorption cross section greatly exceeds their physical dimension. Such objects are able to recei…
Ground states of a Klein-Gordon field with Robin boundary conditions in global anti-de Sitter spacetime
Claudio Dappiaggi, Hugo Ferreira, Alessio Marta
We consider a real, massive scalar field both on the -dimensional anti--de Sitter (AdS) spacetime and on its universal cover CAdS. In the second scenario, we extend the…
Fundamental solutions for the wave operator on static Lorentzian manifolds with timelike boundary
Claudio Dappiaggi, Nicolò Drago, Hugo Ferreira
We consider the wave operator on static, Lorentzian manifolds with timelike boundary and we discuss the existence of advanced and retarded fundamental solutions in terms of boundar…
Mode solutions for a Klein-Gordon field in anti-de Sitter spacetime with dynamical boundary conditions of Wentzell type
Claudio Dappiaggi, Hugo R. C. Ferreira, Benito A. Juárez-Aubry
We study a real, massive Klein-Gordon field in the Poincaré fundamental domain of the -dimensional anti-de Sitter (AdS) spacetime, subject to a particular choice of dynamica…
Superradiant instabilities in the Kerr-mirror and Kerr-AdS black holes with Robin boundary conditions
Hugo R. C. Ferreira, Carlos A. R. Herdeiro
It has been recently observed that a scalar field with Robin boundary conditions (RBCs) can trigger both a superradiant and a bulk instability for a BTZ black hole (BH). To underst…
Superradiance in the BTZ black hole with Robin boundary conditions
Claudio Dappiaggi, Hugo R. C. Ferreira, Carlos A. R. Herdeiro
We show the existence of superradiant modes of massive scalar fields propagating in BTZ black holes when certain Robin boundary conditions, which never include the commonly conside…
Ground state for a massive scalar field in BTZ spacetime with Robin boundary conditions
Francesco Bussola, Claudio Dappiaggi, Hugo R. C. Ferreira +1
We consider a real, massive scalar field in BTZ spacetime, a 2+1-dimensional black hole solution of the Einstein's field equations with a negative cosmological constant. First, we…
Stationary scalar clouds around a BTZ black hole
Hugo R. C. Ferreira, Carlos A. R. Herdeiro
We establish the existence of stationary clouds of massive test scalar fields around BTZ black holes. These clouds are zero-modes of the superradiant instability and are possible w…
On the algebraic quantization of a massive scalar field in anti-de-Sitter spacetime
Claudio Dappiaggi, Hugo R. C. Ferreira
We discuss the algebraic quantization of a real, massive scalar field in the Poincaré patch of the (d+1)-dimensional anti-de Sitter spacetime, with arbitrary boundary conditions. B…
Hadamard states for a scalar field in anti-de Sitter spacetime with arbitrary boundary conditions
Claudio Dappiaggi, Hugo R. C. Ferreira
We consider a real, massive scalar field on , the Poincaré domain of the -dimensional anti-de Sitter (AdS) spacetime. We first determine all admissible bou…
Quantum field theory on rotating black hole spacetimes
Hugo R. C. Ferreira
This thesis is concerned with the development of a general method to compute renormalised local observables for quantum matter fields, in a given quantum state, on a rotating black…
Renormalized vacuum polarization of rotating black holes
Hugo R. C. Ferreira
Quantum field theory on rotating black hole spacetimes is plagued with technical difficulties. Here, we describe a general method to renormalize and compute the vacuum polarization…
Renormalized vacuum polarization on rotating warped AdS3 black holes
Hugo R. C. Ferreira, Jorma Louko
We compute the renormalized vacuum polarization of a massive scalar field in the Hartle-Hawking state on (2+1)-dimensional rotating, spacelike stretched black hole solutions to Top…
Stability of warped AdS3 black holes in Topologically Massive Gravity under scalar perturbations
Hugo R. C. Ferreira
We demonstrate that the warped AdS3 black hole solutions of Topologically Massive Gravity are classically stable against massive scalar field perturbations by analysing the quasino…