On Lax-Phillips semigroups

Details On Lax-Phillips semigroups On Lax-Phillips semigroups

2004-10-13

arxiv.org/abs/math-ph/0410036v1

Physics

Mathematical Physics

16 pages

Scientific paper

Lax-Phillips evolutions are described by two-space scattering systems. The canonical identification operator is characterized for Lax-Phillips evolutions, whose outgoing and incoming projections commute. In this case a (generalized) Lax-Phillips semigroup can be introduced and its spectral theory is considered. In the special case, originally considered by Lax and Phillips (where the outgoing and incoming subspaces are mutually orthogonal), this semigroup coincides with that introduced by Lax and Phillips. In the more general case the existence of the semigroup is not coupled with the (global) holomorphic continuability of the scattering matrix into the upper half plane. The basic connection of the Lax-Phillips semigroup to the so-called characteristic semigroup of the reference evolution is emphasized.

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