Probing Penrose-type singularities in sonic black holes
arXiv:2407.18165 · doi:10.1088/1361-6382/ae2412
Abstract
Addressing the general question whether Penrose singularities physically exist inside black holes, we investigate the problem in the context of an analogue system, a flowing laboratory liquid, for which the governing equations are at least in principle known to all relevant scales, and in all regions of the effective spacetime. We suggest to probe the physical phenomena taking place close to the singularity in the interior of a D analogue black hole arising from a polytropic, inviscid, irrotational, and axisymmetric steady flow, and propose to this end an experimental setup in a Bose-Einstein condensate. Our study provides concrete evidence, for a well understood dynamical system, that the Einstein equations are not necessary for a singularity to form, demonstrating that Penrose-type spacetime singularities can potentially also exist in non-Einsteinian theories of gravity. Finally, we demonstrate how the singularity is physically avoided in our proposed laboratory setup.
7+7 pages, 3+1 figures; version as submitted to journal
References in corpus (40)
- Theory of Bose-Einstein condensation in trapped gases
- Fiber-optical analogue of the event horizon
- Sonic analog of gravitational black holes in Bose-Einstein condensates
- Observation of quantum Hawking radiation and its entanglement in an analogue black hole
- Measurement of stimulated Hawking emission in an analogue system
- An Atom Laser with a cw Output Coupler
- Observation of thermal Hawking radiation at the Hawking temperature in an analogue black hole
- Numerical observation of Hawking radiation from acoustic black holes in atomic Bose-Einstein condensates
- Analog gravity from Bose-Einstein condensates
- Observation of negative-frequency waves in a water tank: A classical analogue to the Hawking effect?
- The 1965 Penrose singularity theorem
- Observation of Stimulated Hawking Radiation in Optics
- The Raychaudhuri equations: a brief review
- An acoustic black hole in a stationary hydrodynamic flow of microcavity polaritons
- Observation of noise correlated by the Hawking effect in a water tank
- Observation of stationary spontaneous Hawking radiation and the time evolution of an analogue black hole
- Simulation of Panleve-Gullstrand black hole in thin 3He-A film
- Black hole and Hawking radiation by type-II Weyl fermions
- Spacetime completeness of non-singular black holes in conformal gravity
- Hawking-like radiation does not require a trapped region
- Analog Hawking radiation from an acoustic black hole in a flowing polariton superfluid
- Causal structure of acoustic spacetimes
- Acoustic black holes in a two-dimensional "photon-fluid"
- Unexpectedly large surface gravities for acoustic horizons?
- Generalized Shock Solutions for Hydrodynamic Black Hole Accretion
- Cosmological particle production in emergent rainbow spacetimes
- Vortex geometry for the equatorial slice of the Kerr black hole
- Light Rays, Singularities, and All That
- Acoustic horizons in axially symmetric relativistic accretion
- Has Hawking radiation been measured?
- Black and White Holes at Material Junctions
- Geometric scalar theory of gravity
- Horizons and Ergoregions in Superfluids
- On the existence of steady-state black hole analogues in finite quasi-one-dimensional Bose-Einstein condensates
- Quasiparticle universes in Bose-Einstein condensates
- Type-II Weyl semimetal vs gravastar
- Acoustic geometry obtained through the perturbation of the Bernoulli's constant
- Dispersive censor of acoustic spacetimes with a shock-wave singularity
- An Analytical Study on the Multi-critical Behaviour and Related Bifurcation Phenomena for Relativistic Black Hole Accretion
- Bondi flow revisited