Mathematics – Spectral Theory
Scientific paper
2011-12-13
Mathematics
Spectral Theory
This paper has been withdrawn by the author in order to correct reference [3] respect to the $C^1(A)$-property
Scientific paper
We apply Mourre theory to compatible Laplacians on manifolds with corners of codimension 2 in order to prove absence of singular spectrum, that non-threshold eigenvalues have finite multiplicity and could accumulate only at thresholds or infinity. It turns out that we need Mourre estimates on manifolds with cylindrical ends where the results are both expected and consequences of more general theorems. In any case we also provide a description, interesting in its own, of Mourre theory in such context that makes our text complete and suggests generalizations to higher order codimension corners. We use theorems of functional analysis that are suitable for these geometric applications.
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