Analogue black hole spectroscopy; or, how to listen to dumb holes

Author(s)

Torres, Theo ^[1] ; Patrick, Sam ^[1] ; Richartz, Mauricio ^[2] ; Weinfurtner, Silke ^{[3, 1, 4]}

Affiliation

^[1] Univ Nottingham, Sch Math Sci, Univ Pk, Nottingham NG7 2RD - England

^[2] Univ Fed ABC UFABC, Ctr Matemat Comp & Cognicao, BR-09210170 Santo Andre, SP - Brazil

^[3] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD - England

^[4] Univ Nottingham, Ctr Math & Theoret Phys Quantum Nonequilibrium Sy, Nottingham NG7 2RD - England

• Document type: Journal article
• Source: Classical and Quantum Gravity; v. 36, n. 19 OCT 10 2019.
• Web of Science Citations: 0

Abstract

Spectroscopy is a fundamental tool in science which consists in studying the response of a system as a function of frequency. Among its many applications in Physics, Biology, Chemistry and other fields, the possibility of identifying objects and structures through their emission spectra is remarkable and incredibly useful. In this paper we apply the spectroscopy idea to a numerically simulated hydrodynamical flow, with the goal of developing a new, non-invasive flow measurement technique. Our focus lies on an irrotational draining vortex, which can be seen, under specific conditions, as the analogue of a rotating black hole (historically named a dumb hole). This paper is a development of a recent experiment that suggests that irrotational vortices and rotating black holes share a common relaxation process, known as the ringdown phase. We apply techniques borrowed from black hole physics to identify vortex flows from their characteristic spectrum emitted during this ringdown phase. We believe that this technique is a new facet of the fluid-gravity analogy and constitutes a promising way to investigate experimentally vortex flows in fluids and superfluids alike. (AU)

• FAPESP's process: 13/09357-9 - Physics and geometry of spacetime
• Grantee: Alberto Vazquez Saa
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 18/10597-8 - Quasinormal modes of a hydrodynamical black hole
• Grantee: Maurício Richartz
• Support Opportunities: Scholarships abroad - Research