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We consider the free streaming operator associated with conservative boundary conditions. It is known that this operator (with its usual domain) admits an extension A which generates a C 0 -semigroup $$(V_H (t))_{t \geqslant 0} $$ in L 1 . With techniques borrowed from the additive perturbation theory of substochastic semigroups, we describe precisely its domain and provide necessary and sufficient conditions ensuring $$(V_H (t))_{t \geqslant 0} $$ to be stochastic. We apply these results to examples from kinetic theory.
Journal of Evolution Equations – Springer Journals
Published: Nov 1, 2005
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