SciPost Submission Page
Induced density correlations in a sonic black hole condensate
by Yi-Hsieh Wang, Ted Jacobson, Mark Edwards, Charles W. Clark
- Published as SciPost Phys. 3, 022 (2017)
|As Contributors:||Charles Clark · Mark Edwards · Yi-Hsieh Wang|
|Submitted by:||Wang, Yi-Hsieh|
|Submitted to:||SciPost Physics|
|Domain(s):||Theor. & Comp.|
|Subject area:||Quantum Physics|
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.
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Submission & Refereeing History
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
1. Timely topic
2. The paper provides new insight into the role of correlations in the presence of sonic horizons
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.