Publication

Finite parts of the spectrum of a Riemann surface

Gilles André Courtois
1990
Journal paper
Abstract

Let S and SS' be compact Riemann surfaces of the same genus g (gge2)ge 2) endowed with the Poincaré metric of constant negative curvature -1. par The authors show that for every epsilon>0epsilon >0, there exists an integer m=m(g,epsilon)m=m(g,epsilon) with the property: Assume that (1) injectivity radius of S and SgeepsilonS'ge epsilon, and (2) the first m=m(g,epsilon)m=m(g,epsilon) eigenvalues of the Laplacian of S and SS' coincide, then S and SS' are isospectral. par The authors conjecture that the integer m will not depend on epsilonepsilon that is, the theorem holds with an integer which depends only on the genus. par For the proof, a model of Teichmüller space is described and the analyticity of the resolvent of Laplacian on this space is proved. Also the authors note that the injectivity radius is estimated by a finite part of the spectrum (=(= the number of eigenvalues of the Laplacian in the interval [1/4,1]).

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