SciPost Submission Page
Induced density correlations in a sonic black hole condensate
by Yi-Hsieh Wang, Ted Jacobson, Mark Edwards, Charles W. Clark
This Submission thread is now published as
Submission summary
| Authors (as registered SciPost users): | Charles Clark · Mark Edwards · Theodore Jacobson · Yi-Hsieh Wang |
| Submission information | |
|---|---|
| Preprint Link: | http://arxiv.org/abs/1705.01907v2 (pdf) |
| Date accepted: | 2017-09-05 |
| Date submitted: | 2017-07-18 02:00 |
| Submitted by: | Wang, Yi-Hsieh |
| Submitted to: | SciPost Physics |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approaches: | Theoretical, Computational |
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.
Published as SciPost Phys. 3, 022 (2017)
Reports on this Submission
Report #1 by Anonymous (Referee 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