Displaying similar documents to “On poles of scattering matrices for several convex bodies”

The Lax-Phillips infinitesimal generator and the scattering matrix for automorphic functions

Yoichi Uetake (2007)

Annales Polonici Mathematici

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We study the infinitesimal generator of the Lax-Phillips semigroup of the automorphic scattering system defined on the Poincaré upper half-plane for SL₂(ℤ). We show that its spectrum consists only of the poles of the resolvent of the generator, and coincides with the poles of the scattering matrix, counted with multiplicities. Using this we construct an operator whose eigenvalues, counted with algebraic multiplicities (i.e. dimensions of generalized eigenspaces), are precisely the non-trivial...