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<https://discovery.ucl.ac.uk/id/eprint/1569444> <http://purl.org/dc/terms/title> "Approximation and Equidistribution of Phase Shifts: Spherical Symmetry"^^<http://www.w3.org/2001/XMLSchema#string> .
<https://discovery.ucl.ac.uk/id/eprint/1569444> <http://purl.org/ontology/bibo/abstract> "Consider a semiclassical Hamiltonian\r\nHV,h:=h2Δ+V−E,\r\nHV,h:=h2Δ+V−E,\r\nwhere h > 0 is a semiclassical parameter, Δ is the positive Laplacian on   Rd,VRd,V  is a smooth, compactly supported central potential function and E > 0 is an energy level. In this setting the scattering matrix Sh(E) is a unitary operator on   L2(Sd−1)L2(Sd−1) , hence with spectrum lying on the unit circle; moreover, the spectrum is discrete except at 1.\r\nWe show under certain additional assumptions on the potential that the eigenvalues of Sh(E) can be divided into two classes: a finite number   ∼cd(RE−−√/h)d−1∼cd(RE/h)d−1 , as   h→0h→0 , where B(0, R) is the convex hull of the support of the potential, that equidistribute around the unit circle, and the remainder that are all very close to 1. Semiclassically, these are related to the rays that meet the support of, and hence are scattered by, the potential, and those that do not meet the support of the potential, respectively.\r\n\r\nA similar property is shown for the obstacle problem in the case that the obstacle is the ball of radius R."^^<http://www.w3.org/2001/XMLSchema#string> .
<https://discovery.ucl.ac.uk/id/eprint/1569444> <http://purl.org/dc/terms/date> "2014-02" .
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