Self-amplifying Hawking radiation and its background: A numerical study

Jeff Steinhauer and Juan Ramón Muñoz de Nova
Phys. Rev. A 95, 033604 – Published 2 March 2017

Abstract

We numerically study an analog black hole with two horizons with parameters similar to a recent experiment. We find that the Hawking radiation exists on a background which contains a density oscillation, a zero-frequency ripple. The Hawking radiation evolves from spontaneous to self-amplifying, while the background ripple grows steadily with no qualitative change. It is seen that the self-amplifying Hawking radiation has a nonzero frequency. This frequency is independent of the reference frame since it is the magnitude of the wave which oscillates, as in a standing wave. The background ripple appears even before the inner horizon is created, in contrast to predictions. Furthermore, we find that technical noise and shot-to-shot variations in the number of atoms are not sufficient to cause the observed correlation function. This work is in agreement with the recent observation of self-amplifying Hawking radiation, and explains some of the features seen. In contrast to some recent works, our study differentiates between the Hawking radiation observed, and the evolution of the background.

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  • Received 9 August 2016

DOI:https://doi.org/10.1103/PhysRevA.95.033604

©2017 American Physical Society

Physics Subject Headings (PhySH)

General PhysicsGravitation, Cosmology & AstrophysicsAtomic, Molecular & Optical

Authors & Affiliations

Jeff Steinhauer and Juan Ramón Muñoz de Nova

  • Department of Physics, Technion—Israel Institute of Technology, Technion City, Haifa 32000, Israel

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Issue

Vol. 95, Iss. 3 — March 2017

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