Geometric and probabilistic aspects of boson lattice models

Details Geometric and probabilistic aspects of boson lattice models Geometric and probabilistic aspects of boson lattice models

2001-03-03

arxiv.org/abs/math-ph/0103002v1

Progr. Probab. 51, 363-391, Birkh\"auser (2002)

Physics

Mathematical Physics

22 pages, 8 figures

Scientific paper

This review describes quantum systems of bosonic particles moving on a lattice. These models are relevant in statistical physics, and have natural ties with probability theory. The general setting is recalled and the main questions about phase transitions are addressed. A lattice model with Lennard-Jones potential is studied as an example of a system where first-order phase transitions occur. A major interest of bosonic systems is the possibility of displaying a Bose-Einstein condensation. This is discussed in the light of the main existing rigorous result, namely its occurrence in the hard-core boson model. Finally, we consider another approach that involves the lengths of the cycles formed by the particles in the space-time representation; Bose-Einstein condensation should be related to positive probability of infinite cycles.

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