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Non-amenability and spontaneous symmetry breaking – the hyperbolic spin-chain. (English) Zbl 1088.82007

Spontaneous symmetry breaking is typically studied in the case where the symmetry group is amenable. The authors employ the hyperbolic spin chain to study this phenomenon for non-amenable groups, which in the case considered is SO(1,2).

MSC:

82B20 Lattice systems (Ising, dimer, Potts, etc.) and systems on graphs arising in equilibrium statistical mechanics
81R40 Symmetry breaking in quantum theory