Abstract
We introduce a notion of relative isospectrality for surfaces with boundary having possibly non-compact ends either conformally compact or asymptotic to cusps. We obtain a compactness result for such families via a conformal surgery that allows us to reduce to the case of surfaces hyperbolic near infinity recently studied by Borthwick and Perry, or to the closed case by Osgood, Phillips, and Sarnak if there are only cusps.
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Notes
The function ξ is closely related to the ‘scattering phase’; see [10].
When acting on half-densities.
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Acknowledgements
The authors are grateful to David Borthwick, Gilles Carron, Andrew Hassell, Rafe Mazzeo, and Richard Melrose for helpful conversations and to the anonymous referee for their comments.
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Communicated by Steven Zelditch.
P. Albin was partially funded by NSF grant DMS-1104533. C.L. Aldana was partially funded by FCT project ptdc/mat/101007/2008. Registered at MPG, AEI-2012-059. F. Rochon was supported by grant DP120102019.
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Albin, P., Aldana, C.L. & Rochon, F. Compactness of Relatively Isospectral Sets of Surfaces Via Conformal Surgeries. J Geom Anal 25, 1185–1210 (2015). https://doi.org/10.1007/s12220-013-9463-0
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DOI: https://doi.org/10.1007/s12220-013-9463-0