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arXiv · 2001.10647

Caustics of weakly Lagrangian distributions

Sean Gomes·Jared Wunsch
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Abstract

We study semiclassical sequences of distributions $u_h$ associated to a Lagrangian submanifold of phase space $\lag \subset T^*X$. If $u_h$ is a semiclassical Lagrangian distribution, which concentrates at a maximal rate on $\lag,$ then the asymptotics of $u_h$ are well-understood by work of Arnol'd, provided $\lag$ projects to $X$ with a stable Lagrangian singularity. We establish sup-norm estimates on $u_h$ under much more general hypotheses on the rate at which it is concentrating on $\lag$ (again assuming a stable projection). These estimates apply to sequences of eigenfunctions of integrable and KAM Hamiltonians.

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Sean Gomes, Jared Wunsch. 2020-01-29. Caustics of weakly Lagrangian distributions. https://arxiv.org/abs/2001.10647

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