Relation between Feynman cycles and off-diagonal long-range order.

@article{Ueltschi2006RelationBF,
  title={Relation between Feynman cycles and off-diagonal long-range order.},
  author={Daniel Ueltschi},
  journal={Physical review letters},
  year={2006},
  volume={97 17},
  pages={
          170601
        }
}
  • Daniel Ueltschi
  • Published 2006
  • Physics, Medicine, Mathematics
  • Physical review letters
  • The usual order parameter for Bose-Einstein condensation involves the off-diagonal correlation function of Penrose and Onsager, but an alternative is Feynman's notion of infinite cycles. We present a formula that relates both order parameters. We discuss its validity with the help of rigorous results and heuristic arguments. The conclusion is that infinite cycles do not always represent the Bose condensate. 

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