Statistical properties of one dimensional attractive Bose gas
  Using classical field approximation we present the first study of statistical properties of one dimensional Bose gas with attractive interaction. The canonical probability distribution is generated with the help of a Monte Carlo method. This way we obtain not only the depletion of the condensate with growing temperature but also its fluctuations. The most important is our discovery of a reduced coherence length, the phenomenon observed earlier only for the repulsive gas, known as quasicondensation. 
Przemyslaw Bienias, Krzysztof Pawlowski, Mariusz Gajda and Kazimierz   Rzazewski
quant-ph cond-mat.quant-gas