Nonlocal density correlations as a signature of Hawking radiation from acoustic black holes

Year: 2008

Authors: Balbinot R., Fabbri A., Fagnocchi S., Recati A., Carusotto I.

Autors Affiliation: Dipartimento di Fisica dell’Università di Bologna and INFN Sezione 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;
Centro Studi e Ricerche “Enrico Fermi,” Compendio Viminale, 00184 Roma, Italy;
CNR-INFM BEC Center and Dipartimento di Fisica, Università di Trento, via Sommarive 14, I-38050 Povo, Trento, Italy

Abstract: We have used the analogy between gravitational systems and nonhomogeneous fluid flows to calculate the density-density correlation function of an atomic Bose-Einstein condensate in the presence of an acoustic black hole. The emission of correlated pairs of phonons by Hawking-like process results into a peculiar long-range density correlation. Quantitative estimations of the effect are provided for realistic experimental configurations.


Volume: 78 (2)      Pages from: 021603  to: 021603

More Information: We are grateful to R. Parentani and W. Unruh for stimulating discussions. S.F. thanks \”E. Fermi\” Center for supporting her research. A.R. and I.C. thank EuroQUAM-FerMix for financial support.
DOI: 10.1103/PhysRevA.78.021603

Citations: 140
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