59 citations · 154 across the 9 of their papers we have counts for
9 papers · 1 filter
Black hole spectral instabilities in the laboratory: Shallow water analogue
Mateus Malato Corrêa, Caio F. B. Macedo, Rodrigo Panosso Macedo +1
Small deviations in the spacetime around black holes can lead to instabilities in the underlying quasinormal mode spectrum, potentially altering the hierarchy of its overtones. A p…
Ergoregion instability in a fluid with vorticity
Leandro A. Oliveira, Carolina L. Benone, Luís C. B. Crispino
We investigate perturbations in a rotational and incompressible fluid flow. Interested in the phenomenon analogous to the black hole ergoregion instability, we verify the influence…
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…
Ergoregion instability of a rotating quantum system
Leandro A. Oliveira, Luis J. Garay, Luís C. B. Crispino
Using the analogy between acoustic perturbations in an ideal fluid and the description of a Klein-Gordon scalar field in a curved spacetime, we study the quasinormal modes of a qua…
Quasinormal modes of the polytropic hydrodynamic vortex
Leandro A. Oliveira, Vitor Cardoso, Luís C. B. Crispino
Analogue systems are a powerful instrument to investigate and understand in a controlled setting many general-relativistic effects. Here, we focus on superradiant-triggered instabi…
Tidal Forces in Reissner-Nordström Spacetimes
Luís C. B. Crispino, Atsushi Higuchi, Leandro A. Oliveira +1
We analyze the tidal forces produced in the spacetime of Reissner-Nordström black holes. We point out that the radial component of the tidal force changes sign just outside the eve…
Quasinormal modes and Regge poles of the canonical acoustic hole
Sam R. Dolan, Leandro A. Oliveira, Luis C. B. Crispino
We compute the quasinormal mode frequencies and Regge poles of the canonical acoustic hole (a black hole analogue), using three methods. First, we show how damped oscillations aris…
Ergoregion instability: The hydrodynamic vortex
Leandro A. Oliveira, Vitor Cardoso, Luís C. B. Crispino
Four-dimensional, asymptotically flat spacetimes with an ergoregion but no horizon have been shown to be linearly unstable against a superradiant-triggered mechanism. This result h…
Resonances of a rotating black hole analogue
Sam R. Dolan, Leandro A. Oliveira, Luís C. B. Crispino
Under certain conditions, sound waves in a fluid may be governed by a Klein-Gordon equation on an `effective spacetime' determined by the background flow properties. Here we consid…