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arXiv · 2404.13738

Quasimode concentration on compact space forms

Xiaoqi Huang·Christopher D. Sogge
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Abstract

We show that the upper bounds for the $L^2$-norms of $L^1$-normalized quasimodes that we obtained in [9] are always sharp on any compact space form. This allows us to characterize compact manifolds of constant sectional curvature using the decay rates of lower bounds of $L^1$-norms of $L^2$-normalized log-quasimodes fully resolving a problem initiated by the second author and Zelditch [15]. We are also able to characterize such manifolds by the concentration of quasimodes near periodic geodesics as measured by $L^2$-norms over thin geodesic tubes.

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Xiaoqi Huang, Christopher D. Sogge. 2024-04-21. Quasimode concentration on compact space forms. https://arxiv.org/abs/2404.13738

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