Departing from thermality of analogue Hawking radiation in a Bose-Einstein condensate

TL;DR

This paper investigates quantum fluctuations in a Bose-Einstein condensate simulating an acoustic black hole, revealing deviations from thermality in the analogue Hawking radiation through detailed modeling and comparison with experiments.

Contribution

It introduces a comprehensive model including evanescent channels and zero modes to accurately reproduce experimental data and analyze the non-thermal nature of analogue Hawking radiation.

Findings

Reproduces experimental density correlation measurements accurately.

Shows significant departure from thermality in the analogue Hawking radiation.

Provides a detailed analysis of the Hawking temperature in the model.

Abstract

We study the quantum fluctuations in a one dimensional Bose-Einstein condensate realizing an analogous acoustic black hole. The taking into account of evanescent channels and of zero modes makes it possible to accurately reproduce recent experimental measurements of the density correlation function. We discuss the determination of Hawking temperature and show that in our model the analogous radiation presents some significant departure from thermality.