Anomalous Fluctuations of the Condensate in Interacting Bose Gases
Abstract
We find that the fluctuations of the condensate in a weakly interacting Bose gas confined in a box of volume V follow the law <δN20>~V4/3. This anomalous behavior arises from the occurrence of infrared divergencies due to phonon excitations and holds also for strongly correlated Bose superfluids. The analysis is extended to an interacting Bose gas confined in a harmonic trap where the fluctuations are found to exhibit a similar anomaly.
- Publication:
-
Physical Review Letters
- Pub Date:
- June 1998
- DOI:
- 10.1103/PhysRevLett.80.5040
- arXiv:
- arXiv:cond-mat/9711065
- Bibcode:
- 1998PhRvL..80.5040G
- Keywords:
-
- Condensed Matter
- E-Print:
- 4 pages, RevTeX