Affiliation:
1. Department of Economics Babeş-Bolyai University 400591 Cluj-Napoca , Romania ; and Institute of Applied Mathematics, Óbuda University, 1034 Budapest, Hungary
Abstract
Abstract
The paper is devoted to the study of fine properties of the first eigenvalue on negatively curved spaces. First, depending on the parity of the space dimension,
we provide asymptotically sharp harmonic-type expansions of the first eigenvalue for large geodesic balls in the model n-dimensional hyperbolic space, complementing the results of Borisov and Freitas (2017), Hurtado, Markvorsen and Palmer (2016)
and Savo (2008);
in odd dimensions, such eigenvalues appear as roots of an inductively constructed transcendental equation.
We then give a synthetic proof of Cheng’s sharp eigenvalue comparison theorem in metric measure spaces satisfying a Bishop–Gromov-type volume monotonicity hypothesis. As a byproduct, we provide an example of simply connected, non-compact Finsler manifold with constant negative flag curvature whose first eigenvalue is zero; this result is in a sharp contrast with its celebrated Riemannian counterpart due to McKean (1970).
Our proofs are based on specific properties of the Gaussian hypergeometric function combined with intrinsic aspects of the negatively curved smooth/non-smooth spaces.
Funder
Nemzeti Kutatási Fejlesztési és Innovációs Hivatal
Subject
Applied Mathematics,Analysis
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