Hearing the weights of weighted projective planes |
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Authors: | Miguel Abreu Emily B Dryden Pedro Freitas Leonor Godinho |
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Institution: | (1) Centro de Análise Matemática, Geometria e Sistemas Dinamicos, Departamento de Matemática, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;(2) Department of Mathematics, Bucknell University, Lewisburg, PA 17837, USA;(3) Complexo Interdisciplinar, Mathematical Physics Group of the University of Lisbon, Av. Prof. Gama Pinto 2, Lisboa, 1649-003, Portugal |
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Abstract: | Which properties of an orbifold can we “hear,” i.e., which topological and geometric properties of an orbifold are determined by its Laplace spectrum? We consider this question for a class of four-dimensional Kähler orbifolds: weighted projective planes \(M := {\mathbb{C}}P^2(N_1, N_2, N_3)\) with three isolated singularities. We show that the spectra of the Laplacian acting on 0- and 1-forms on M determine the weights N 1, N 2, and N 3. The proof involves analysis of the heat invariants using several techniques, including localization in equivariant cohomology. We show that we can replace knowledge of the spectrum on 1-forms by knowledge of the Euler characteristic and obtain the same result. Finally, after determining the values of N 1, N 2, and N 3, we can hear whether M is endowed with an extremal Kähler metric. |
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Keywords: | Laplace spectrum Heat invariants Weighted projective planes |
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