Year: 1998
Type: article
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 $〈\ensuremath{\delta}{N}_{0}^{2}〉\ensuremath{\sim}{V}^{4/3}$. 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.
Source: Physical Review Letters
Authors: S. Giorgini, L. P. Pitaevskii, S. Stringari
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2042003207