DISPERSION FOR THE WAVE EQUATION WITH NEUMANN BOUNDARY CONDITION INSIDE GENERAL STRICTLY CONVEX DOMAINS
Abstract
We consider the wave equation on a manifold of dimension d>1 with smooth strictly convex boundary, with Neumann boundary condition. We construct a sharp local in time parametrix for the Neumann wave equation near glancing, extending the classical Melrose-Taylor construction for the Dirichlet problem to the Neumann boundary condition. Our construction is based on the microlocal framework and the parametrix developed in [10] for the Dirichlet problem, together with the Melrose-Taylor argument for solving the transport equations under more general, affine-type boundary conditions. Once the Neumann parametrix is constructed, the dispersive and Strichartz estimates follow the analysis developed in [10] for the Dirichlet problem. We therefore only recall the main ingredients of that argument. In particular, the fixed time decay rate for the Green function exhibits the same loss of 1/4 with respect to the boundaryless case, associated with swallowtail type singularities in the wave front set, and this decay is optimal. Moreover, the corresponding Strichartz estimates are obtained by balancing lossy long time estimates at a given incidence with short time ones with no loss: for d=3, this heuristically means that, on average, the decay loss is only 1/6 .
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BibTeX
@misc{ivanovici2026dispersion,
title = {{DISPERSION FOR THE WAVE EQUATION WITH NEUMANN BOUNDARY CONDITION INSIDE GENERAL STRICTLY CONVEX DOMAINS}},
author = {Oana Ivanovici and Diego Sanchez Sanz},
howpublished = {HAL},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.40114},
eprint = {2609.40114},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05769065v1},
note = {CC BY-NC-SA 4.0},
}
RIS
TY - UNPB
TI - DISPERSION FOR THE WAVE EQUATION WITH NEUMANN BOUNDARY CONDITION INSIDE GENERAL STRICTLY CONVEX DOMAINS
AU - Oana Ivanovici
AU - Diego Sanchez Sanz
PY - 2026
DA - 2026/09/29
PB - HAL
DO - 10.48550/arxiv.2609.40114
UR - https://hal.science/hal-05769065v1
AB - We consider the wave equation on a manifold of dimension d>1 with smooth strictly convex boundary, with Neumann boundary condition. We construct a sharp local in time parametrix for the Neumann wave equation near glancing, extending the classical Melrose-Taylor construction for the Dirichlet problem to the Neumann boundary condition. Our construction is based on the microlocal framework and the parametrix developed in [10] for the Dirichlet problem, together with the Melrose-Taylor argument for solving the transport equations under more general, affine-type boundary conditions. Once the Neumann parametrix is constructed, the dispersive and Strichartz estimates follow the analysis developed in [10] for the Dirichlet problem. We therefore only recall the main ingredients of that argument. In particular, the fixed time decay rate for the Green function exhibits the same loss of 1/4 with respect to the boundaryless case, associated with swallowtail type singularities in the wave front set, and this decay is optimal. Moreover, the corresponding Strichartz estimates are obtained by balancing lossy long time estimates at a given incidence with short time ones with no loss: for d=3, this heuristically means that, on average, the decay loss is only 1/6 .
ER -