Abstract
The Markovian description of diffusion in velocity space involves a semigroup, which because of detailed balance is conveniently interpreted in a weightedL 2-space. The collision operatorC, defined by the corresponding generator, is positive semidefinite in this space. For a jump process and a continuous process we obtain the collision operators of the linear Boltzmann and Fokker-PIanck equations, respectively. If in the latter case the friction tensor has a nonvanishing limit asυ → ∞, the spectrum ofC is discrete. The Fourier-transformed transport operatorT k=C+ik·v is studied as a holomorphic family of sectorial operators. In the stated Fokker-Planck example, the spectrum ofT k remains discrete for arbitrary k.
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On leave from the Department of Physics, University of Ljubljana, Ljubljana, Yugoslavia.
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Illner, R., Kuščer, I. Collision operators as generators of Markov processes and their spectra. J Stat Phys 20, 303–316 (1979). https://doi.org/10.1007/BF01011939
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DOI: https://doi.org/10.1007/BF01011939