Dima Ioffe
A note on the quantum Widom-Rowlison model
(174K, Postscript)

ABSTRACT.  Using the renormalization methods we show that the symmetry breaking in the 
 quantum Widom-Rowlison model of particles obeying Boltzmann statistics 
occurs at any value of the inverse temperature $\beta >0$ once the 
 activity of the particles is sufficiently large.