The resolvent algebra for oscillating lattice systems: Dynamics, ground   and equilibrium states
  Within the C*-algebraic framework of the resolvent algebra for canonical quantum systems, the structure of oscillating lattice systems with bounded nearest neighbor interactions is studied in any number of dimensions. The global dynamics of such systems acts on the resolvent algebra by automorphisms and there exists a (in any regular representation) weakly dense subalgebra on which this action is pointwise norm continuous. Based on this observation, equilibrium (KMS) states as well as ground states are constructed which are shown to be regular. It is also indicated how to deal with singular interactions and non-harmonic oscillations. 
Detlev Buchholz
math-ph cond-mat.stat-mech math.MP math.OA quant-ph