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arXiv · 1912.13114

Singular Yamabe and Obata Problems

A. Rod Gover·Andrew Waldron
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Abstract

A conformal geometry determines a distinguished, potentially singular, variant of the usual Yamabe problem, where the conformal factor can change sign. When a smooth solution does change sign, its zero locus is a smoothly embedded separating hypersurface that, in dimension three, is necessarily a Willmore energy minimiser or, in higher dimensions, satisfies a conformally invariant analog of the Willmore equation. In any case the zero locus is critical for a conformal functional that generalises the total Q-curvature by including extrinsic data. These observations lead to some interesting global problems that include natural singular variants of a classical problem solved by Obata.

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A. Rod Gover, Andrew Waldron. 2019-12-30. Singular Yamabe and Obata Problems. https://arxiv.org/abs/1912.13114

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