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Analytic continuation of the resolvent of the Laplacian on symmetric spaces of noncompact type. (English) Zbl 1082.58029

Summary: Let \((M,g)\) be a globally symmetric space of noncompact type, of arbitrary rank, and \(\Delta\) its Laplacian. We introduce a new method to analyze \(\Delta\) and the resolvent \((\Delta -\sigma)^{-1}\); this has origins in quantum \(N\)-body scattering, but is independent of the ‘classical’ theory of spherical functions, and is analytically much more robust. We expect that, suitably modified, it will generalize to locally symmetric spaces of arbitrary rank. As an illustration of this method, we prove the existence of a meromorphic continuation of the resolvent across the continuous spectrum to a Riemann surface multiply covering the plane. We also show how this continuation may be deduced using the theory of spherical functions. In summary, this paper establishes a long-suspected connection between the analysis on symmetric spaces and \(N\)-body scattering.

MSC:

58J50 Spectral problems; spectral geometry; scattering theory on manifolds
81U40 Inverse scattering problems in quantum theory
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