Anomalous Fluctuations of the Condensate in Interacting Bose Gases

@article{Giorgini1998AnomalousFO,
  title={Anomalous Fluctuations of the Condensate in Interacting Bose Gases},
  author={S. Giorgini and L. Pitaevskiĭ and S. Stringari},
  journal={Physical Review Letters},
  year={1998},
  volume={80},
  pages={5040-5043}
}
  • S. Giorgini, L. Pitaevskiĭ, S. Stringari
  • Published 1998
  • Physics
  • Physical Review Letters
  • We find that the fluctuations of the condensate in a weakly interacting Bose gas confined in a box of volume $V$ follow the law $ \sim V^{4/3}$. This anomalous behaviour 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.