Instability of the superfluid flow as black-hole lasing effect

  • We show that the critical velocity of a superfluid flow through a penetrable barrier coincides with the onset of the analog black-hole lasing effect. This dynamical instability is triggered by modes resonating in an effective cavity formed by two horizons enclosing the barrier. The location of the horizons is set by v(x)=c(x), with v(x),c(x) being the local fluid velocity and sound speed, respectively. We compute the critical velocity analytically and show that it is univocally determined by the configuration of the horizons. In the limit of broad barriers, the continuous spectrum at the origin of the Hawking-like radiation and of the Landau energetic instability is recovered.

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Author:S. Finazzi, Francesco PiazzaORCiDGND, M. Abad, A. Smerzi, A. Recati
Frontdoor URL
Parent Title (English):Physical Review Letters
Publisher:American Physical Society (APS)
Year of first Publication:2015
Release Date:2023/10/16
Tag:General Physics and Astronomy
First Page:245301
Institutes:Mathematisch-Naturwissenschaftlich-Technische Fakultät
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik / Lehrstuhl für Theoretische Physik III