2014/05/16 by Leandro A. Oliveira, Vitor Cardoso, Vítor Cardoso +1
Physics and Astronomy · #Astronomy #Black Holes and Theoretical Physics #Black hole (networking) #Classical mechanics #Cosmology and Gravitation Theories #Event horizon #Hawking radiation #Horizon #Instability #Mechanics #Micro black hole #Physics #Quantum Electrodynamics and Casimir Effect #Sonic black hole #Theoretical physics #Vortex #gr-qc
paper · pdf · doi:10.1103/physrevd.89.124008
published as Phys. Rev. D 89, 124008 (2014) · 10 pages, 8 figures, 2 tables
arxiv created 2014/05/16 · openalex publication_date 2014/06/06 · arxiv updated 2014/06/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 has wide implications in the search for astrophysically viable alternatives to black holes, but also in the understanding of black holes and Hawking evaporation. Here we investigate this instability in detail for a particular setup that can be realized in the laboratory: the hydrodynamic vortex, an effective geometry for sound waves, with ergoregion and without an event horizon.