SciPost Submission Page

Induced density correlations in a sonic black hole condensate

by Yi-Hsieh Wang, Ted Jacobson, Mark Edwards, Charles W. Clark

Submission summary

As Contributors: Charles Clark · Mark Edwards · Yi-Hsieh Wang
Arxiv Link: http://arxiv.org/abs/1705.01907v2
Date accepted: 2017-09-05
Date submitted: 2017-07-18
Submitted by: Wang, Yi-Hsieh
Submitted to: SciPost Physics
Domain(s): Theor. & Comp.
Subject area: Quantum Physics

Abstract

Analog black/white hole pairs, consisting of a region of supersonic flow, have been achieved in a recent experiment by J. Steinhauer using an elongated Bose-Einstein condensate. A growing standing density wave, and a checkerboard feature in the density-density correlation function, were observed in the supersonic region. We model the density-density correlation function, taking into account both quantum fluctuations and the shot-to-shot variation of atom number normally present in ultracold-atom experiments. We find that quantum fluctuations alone produce some, but not all, of the features of the correlation function, whereas atom-number fluctuation alone can produce all the observed features, and agreement is best when both are included. In both cases, the density-density correlation is not intrinsic to the fluctuations, but rather is induced by modulation of the standing wave caused by the fluctuations.

Current status:

Ontology / Topics

See full Ontology or Topics database.

Black holes Bose-Einstein condensates (BECs) Ultracold atoms

Submission & Refereeing History

Submission 1705.01907v2 on 18 July 2017

Reports on this Submission

Anonymous Report 1 on 2017-8-21 Invited Report

  • Cite as: Anonymous, Report on arXiv:1705.01907v2, delivered 2017-08-21, doi: 10.21468/SciPost.Report.218

Strengths

1. Timely topic
2. The paper provides new insight into the role of correlations in the presence of sonic horizons

Weaknesses

none really

Report

In summary, this is a well written paper, which discusses the timely topic of correlations in the presence of analog event horizons. The paper seems technically correct, and importantly points out that in a recent experiment with a BEC where analog sonic horizons were identified, the density-density correlations may be attributed to atom number fluctuations rather than the quantum fluctuations. I enjoyed reading the paper. The authors carefully explain their methods, and in particular Section III C gives a clear picture of what is going on. To conclude, I do not have anything to complain about. It is a very good paper which will no doubt be well received by the cold atom community and those interested in analog gravity. I suggest the paper is published in its present form.

Requested changes

none

  • validity: top
  • significance: high
  • originality: high
  • clarity: good
  • formatting: perfect
  • grammar: perfect

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