Abstract
For quantum lattice systems a Boltzmann-type evolution arrises according to results of Hugenholtz in the limit of N-scaled time evolution together with an interaction scaled as N^-1/2. According ti Illner-Neunzert this passage to an irreversible dynamics can only happen when the initial state satisfies stronger assumptions than the evolved state. We show that the initial state satisfies space clustering as it is necessary for the construction of a fluctuation algebra whereas the evolved state allows fluctuations only in an appropriate local scaling but not on a mesoscopic level.
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