Volume 114, Number 6, June 2016
|Number of page(s)||6|
|Published online||25 July 2016|
Numerical study of a recent black-hole lasing experiment
1 Dipartimento di Scienza e Alta Tecnologia, Università dell'Insubria - via Valleggio 11, I-22100 Como, Italy
2 INFN, Sezione di Milano - via Celoria 16, I-20133 Milano, Italy
3 INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento - I-38123 Povo, Italy
Received: 15 March 2016
Accepted: 5 July 2016
We theoretically analyse a recent experiment reporting the observation of a self-amplifying Hawking radiation in a flowing atomic condensate (Steinhauer J., Nat. Phys., 10 (2014) 864). We are able to accurately reproduce the experimental observations using a theoretical model based on the numerical solution of a mean-field Gross-Pitaevskii equation that does not include quantum fluctuations of the matter field. In addition to confirming the black-hole lasing mechanism, our results show that the underlying dynamical instability has a classical hydrodynamic origin and is triggered by a seed of deterministic nature, linked to the non-stationary of the process, rather than by thermal or zero-point fluctuations.
PACS: 03.75.Kk – Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow / 04.62.+v – Quantum fields in curved spacetime / 04.70.Dy – Quantum aspects of black holes, evaporation, thermodynamics
© EPLA, 2016
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