Article,

TIME DELAY AND CALABI INVARIANT IN CLASSICAL SCATTERING THEORY

, and .
Reviews in Mathematical Physics, 24 (09): 1250023 (October 2012)
DOI: 10.1142/S0129055X12500237

Abstract

We define, prove the existence and obtain explicit expressions for classical time delay defined in terms of sojourn times for abstract scattering pairs (H0, H) on a symplectic manifold. As a by-product, we establish a classical version of the Eisenbud–Wigner formula of quantum mechanics. Using recent results of Buslaev and Pushnitski on the scattering matrix in Hamiltonian mechanics, we also obtain an explicit expression for the derivative of the Calabi invariant of the Poincaré scattering map. Our results are applied to dispersive Hamiltonians, to a classical particlein a tube and to Hamiltonians on the Poincaré ball.

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