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arXiv · 2503.21527

Dispersive estimates and optimality for Schr\"odinger equations on product cones

Kouichi Taira
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Abstract

In this paper, we study time decay estimates for the Schr\"odinger propagator on the product cone $(X,g)$, where $X=C(\rho \mathbb{S}^{n-1})=(0,\infty)\times \rho\mathbb{S}^{n-1}$. We prove that the usual dispersive estimate holds when the radius $\rho$ is greater than or equal to 1 and fails otherwise. A part of the former result was already established in a recent paper by Jia-Zhang. The method used here relies purely on harmonic analysis, whereas Jia-Zhang employed microlocal analysis to capture the precise asymptotic behavior of the propagator.

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Kouichi Taira. 2025-03-27. Dispersive estimates and optimality for Schr\"odinger equations on product cones. https://arxiv.org/abs/2503.21527

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