Echoes and quasinormal modes of asymmetric black bounces

Abstract

We study quasinormal modes and echoes of symmetric and asymmetric black bounce solutions generated by anisotropic fluids within the framework of general relativity. We derive the effective potential governing massless scalar fields and compute the corresponding quasinormal mode spectra using three independent methods: sixth-order WKB, Pöschl-Teller and time-domain evolution. Our results show that symmetric black bounce configurations with horizons yield a standard single-barrier potential, while horizonless solutions may exhibit multiple potential barriers that generate gravitational wave echoes. These echoes are sensitive to model parameters such as the fluid energy density and the regularizing parameter $a$ that defines the minimal $2$-sphere. The asymmetric models considered recover the Reissner-Nordström solution in their external region but can be bounded or unbounded in the inside, depending on the sign of a parameter. Both cases have similar qualitative properties as far as wave emission is concerned but show no echoes. This makes it very difficult to distinguish them from standard Reissner-Nordström configurations.

26 pages, 9 figures, 2 tables

References in corpus (13)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• The Confrontation between General Relativity and Experiment
• GW170814: A Three-Detector Observation of Gravitational Waves from a Binary Black Hole Coalescence
• Echoes of ECOs: gravitational-wave signatures of exotic compact objects and of quantum corrections at the horizon scale
• Gravitational lensing in the Simpson-Visser black-bounce spacetime in a strong deflection limit
• Gravitational lensing in a black-bounce traversable wormhole spacetime
• Echoes of novel black-bounce spacetimes
• Quasinormal modes of a holonomy corrected Schwarzschild black hole
• Generalized models for black-bounce solutions in $f(R)$ Gravity
• Gravitational-wave echoes from numerical-relativity waveforms via space-time construction near merging compact objects
• Orbits around a black bounce spacetime
• Quantifying Systematic Biases in Black Hole Spectroscopy
• Spectral lines of dirty wormholes