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LOCAL DECAY FOR THE DAMPED WAVE EQUATION IN THE ENERGY SPACE

Published online by Cambridge University Press:  01 April 2016

Julien Royer*
Affiliation:
Institut de Mathématiques de Toulouse, 118 route de Narbonne, 31062 Toulouse Cédex 9, France (julien.royer@math.univ-toulouse.fr)

Abstract

We improve a previous result about the local energy decay for the damped wave equation on $\mathbb{R}^{d}$. The problem is governed by a Laplacian associated with a long-range perturbation of the flat metric and a short-range absorption index. Our purpose is to recover the decay ${\mathcal{O}}(t^{-d+\unicode[STIX]{x1D700}})$ in the weighted energy spaces. The proof is based on uniform resolvent estimates, given by an improved version of the dissipative Mourre theory. In particular, we have to prove the limiting absorption principle for the powers of the resolvent with inserted weights.

Type
Research Article
Copyright
© Cambridge University Press 2016 

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