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Hearing Shapes via p-Adic Laplacians

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arxiv 2303.00833 v1 pith:AGOJGI4C submitted 2023-03-01 math.SP

classification math.SP
keywords graphp-adiccurvereductionspectralspectrumallowsanalytic
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For a finite graph, a spectral curve is constructed as the zero set of a two-variate polynomial with integer coefficients coming from p-adic diffusion on the graph. It is shown that certain spectral curves can distinguish non-isomorphic pairs of isospectral graphs, and can even reconstruct the graph. This allows the graph reconstruction from the spectrum of the associated p-adic Laplacian operator. As an application to p-adic geometry, it is shown that the reduction graph of a Mumford curve and the product reduction graph of a p-adic analytic torus can be recovered from the spectrum of such operators.

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