Non-local density correlations as signal of Hawking radiation in BEC acoustic black holes

Understand

We have used the analogy between gravitational systems and non-homogeneous 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.