An upper bound for the first positive eigenvalue of the Kohn Laplacian on Reinhardt real hypersurfaces
| Autor: | Gian Maria Dall’Ara, Duong Ngoc Son |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Proceedings of the American Mathematical Society. 151:123-133 |
| ISSN: | 1088-6826 0002-9939 |
| DOI: | 10.1090/proc/16077 |
| Popis: | A real hypersurface in $\mathbb{C}^2$ is said to be Reinhardt if it is invariant under the standard $\mathbb{T}^2$-action on $\mathbb{C}^2$. Its CR geometry can be described in terms of the curvature function of its ``generating curve'', i.e., the logarithmic image of the hypersurface in the plane $\mathbb{R}^2$. We give a sharp upper bound for the first positive eigenvalue of the Kohn Laplacian associated to a natural pseudohermitian structure on a compact and strictly pseudoconvex Reinhardt real hypersurface having closed generating curve (which amounts to the $\mathbb{T}^2$-action being free). Our bound is expressed in terms of the $L^2$-norm of the curvature function of the generating curve and is attained if and only if the curve is a circle. 11 pages |
| Databáze: | OpenAIRE |
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