Abstract
We study the consequences of the KMS-condition on the properties of quasi-particles, assuming their existence. We establish (i) If the correlation functions decay sufficiently, we can create them by quasi-free field operators. (ii) The outgoing and incoming quasi-free fields coincide, there is no scattering. (iii) There are may age-operatorsT conjugate toH. For special forms of the dispersion law ε(k) of the quasi-particles there is aT commuting with the number of quasi-particles and its time-monotonicity describes how the quasi-particles travel to infinity.
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