Geodesic
An example of a~Kubo--Martin--Schwinger state for a~nonlinear classical poisson system with infinite-dimensional phase space
Sbornik. Mathematics, Tome 43 (1982) no. 1, pp. 103-115

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A “smoothed” nonlinear Klein–Gordon equation is regarded as the equation of evolution of a classical dynamical system with an infinite-dimensional phase space. It is proved that the wave operators are canonical transformations of this system that linearize it. It is shown that a Gaussian measure induces a Kubo–Martin–Schwinger state for the linear system, and that the preimage of this measure under the canonical transformation implemented by a wave operator is a Kubo–Martin–Schwinger state for the original nonlinear system. Bibliography: 8 titles. 
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     title = {An example of {a~Kubo--Martin--Schwinger} state for a~nonlinear classical poisson system with infinite-dimensional phase space},
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A. A. Arsen'ev. An example of a~Kubo--Martin--Schwinger state for a~nonlinear classical poisson system with infinite-dimensional phase space. Sbornik. Mathematics, Tome 43 (1982) no. 1, pp. 103-115. http://geodesic.mathdoc.fr/item/SM_1982_43_1_a4/