10 papers
Tachyonic modes as a resonant system in weakly curved stellar spacetimes
Bruno S. Felipe, MaurÃcio Richartz
A real scalar field nonminimally coupled to the curvature of an astrophysical object can develop an effective potential that supports, alongside stable oscillatory solutions, a set…
Exceptional lines in the Kerr-Newman black hole spectrum
João Paulo Cavalcante, MaurÃcio Richartz
We investigate massive scalar perturbations of Kerr-Newman black holes, focusing on the quasinormal mode spectrum in the near-extremal regime. We identify a sequ…
Ergodic Hysteresis of the Kerr black hole spectrum
João Paulo Cavalcante, MaurÃcio Richartz, Bruno Carneiro da Cunha
We uncover a cascade of exceptional points (EPs) in the quasinormal mode spectrum of massive scalar perturbations of Kerr black holes, revealing an intricate non-Hermitian structur…
Black-hole spectroscopy from a giant quantum vortex
Pietro Smaniotto, Leonardo Solidoro, Patrik Å vanÄara +5
Black-hole spectroscopy aims to infer the fundamental properties of black holes by analysing the spectrum of gravitational waves emitted as they settle into equilibrium. These reso…
Superradiant scattering by rotating black-bounce black holes
Pedro Henrique Croti Siqueira, MaurÃcio Richartz
We investigate superradiant scattering off a rotating regular black hole described by a black-bounce metric which generalizes the Kerr spacetime of mass and specific angular mo…
When is a sloshing vortex an analogue black hole bomb?
Sam Patrick, Leonardo Solidoro, MaurÃcio Richartz +4
Draining vortices provide a powerful platform for simulating black hole phenomena in tabletop experiments. In realistic fluid systems confined within a finite container, low-freque…