Degenerated codimension 1 crossings and resolvent estimates

Details Degenerated codimension 1 crossings and resolvent estimates Degenerated codimension 1 crossings and resolvent estimates

2008-11-13

arxiv.org/abs/0811.2103v1

Physics

Mathematical Physics

27 pages

Scientific paper

In this article, we analyze the propagation of Wigner measures of a family of solutions to a system of semi-classical pseudodifferential equations presenting eigenvalues crossings on hypersurfaces. We prove the propagation along classical trajectories under a geometric condition which is satisfied for example as soon as the Hamiltonian vector fields are transverse or tangent at finite order to the crossing set. We derive resolvent estimates for semi-classical Schr\"odinger operator with matrix-valued potential under a geometric condition of the same type on the crossing set and we analyze examples of degenerate situations where one can prove transfers between the modes.

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