title: Quantum Signature of Analog Hawking Radiation in Momentum Space.
abstract: We consider a sonic analog of a black hole realized in the one-dimensional flow of a Bose-Einstein condensate. Our theoretical analysis demonstrates that one- and two-body momentum distributions accessible by present-day experimental techniques provide clear direct evidence (i) of the occurrence of a sonic horizon, (ii) of the associated acoustic Hawking radiation, and (iii) of the quantum nature of the Hawking process. The signature of the quantum behavior persists even at temperatures larger than the chemical potential.
authors.affiliation: Laboratoire Charles Fabry, Institut d'Optique-CNRS-Univ. Paris-Sud, 2 Avenue Augustin Fresnel, 91127 Palaiseau, France.
authors.forename: D
authors.initials: D
authors.lastname: Boiron
authors.affiliation: Centro Studi e Ricerche E. Fermi, Piazza del Viminale 1, 00184 Roma, Italy.|Dipartimento di Fisica dell'Università di Bologna, Via Irnerio 46, 40126 Bologna, Italy.|Departamento de Fisica Teorica and IFIC, Universidad de Valencia-CSIC, C. Dr. Moliner 50, 46100 Burjassot, Spain.|Laboratoire de Physique Théorique, CNRS UMR 8627, Bât. 210, Univ. Paris-Sud, 91405 Orsay Cedex, France.
authors.forename: A
authors.initials: A
authors.lastname: Fabbri
authors.affiliation: INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, Via Sommarive 14, 38123 Povo, Italy.
authors.forename: P-É
authors.initials: PÉ
authors.lastname: Larré
authors.affiliation: Laboratoire de Physique Théorique et Modèles Statistiques, CNRS, Univ. Paris Sud, UMR 8626, 91405 Orsay Cedex, France.
authors.forename: N
authors.initials: N
authors.lastname: Pavloff
authors.affiliation: Laboratoire Charles Fabry, Institut d'Optique-CNRS-Univ. Paris-Sud, 2 Avenue Augustin Fresnel, 91127 Palaiseau, France.
authors.forename: C I
authors.initials: CI
authors.lastname: Westbrook
authors.affiliation: National Centre for Nuclear Research, ul. Hoża 69, 00-681 Warsaw, Poland.
authors.forename: P
authors.initials: P
authors.lastname: Ziń