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Pointwise Convergence of Solutions to the Schrödinger Equation on Manifolds

Part of: Linear function spaces and their duals Hyperbolic equations and systems Harmonic analysis in several variables

Published online by Cambridge University Press:  07 January 2019

Xing Wang  and
Chunjie Zhang
Xing Wang
Affiliation:
Department of Mathematics, Wayne State University, Detroit, Michigan 48202, USA Email: xing.wang@wayne.edu
Chunjie Zhang*
Affiliation:
Department of Mathematics, Hangzhou Dianzi University, MHangzhou, 310018, China Email: purezhang@hdu.edu.cn
*
*Chunjie Zhang is the corresponding author.
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Abstract

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Let $(M^{n},g)$ be a Riemannian manifold without boundary. We study the amount of initial regularity required so that the solution to a free Schrödinger equation converges pointwise to its initial data. Assume the initial data is in $H^{\unicode[STIX]{x1D6FC}}(M)$. For hyperbolic space, the standard sphere, and the two-dimensional torus, we prove that $\unicode[STIX]{x1D6FC}>\frac{1}{2}$ is enough. For general compact manifolds, due to the lack of a local smoothing effect, it is hard to improve on the bound $\unicode[STIX]{x1D6FC}>1$ from interpolation. We managed to go below 1 for dimension ${\leqslant}$ 3. The more interesting thing is that, for a one-dimensional compact manifold, $\unicode[STIX]{x1D6FC}>\frac{1}{3}$ is sufficient.

Keywords

pointwise convergenceSchrödinger operatormanifoldStrichartz estimate

MSC classification

Primary: 35L05: Wave equation
Secondary: 46E35: Sobolev spaces and other spaces of “smooth” functions, embedding theorems, trace theorems 42B37: Harmonic analysis and PDE
Type
Article
Information
Canadian Journal of Mathematics , Volume 71 , Issue 4 , August 2019 , pp. 983 - 995
Copyright
© Canadian Mathematical Society 2018 

Footnotes

This work was supported by Zhejiang Provincial Natural Science Foundation (No. LY16A010013) and National Natural Science Foundation of China (Grant No. 11471288). The work was done when the two authors were working together at Johns Hopkins University.

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