Best exponential decay rate of energy for the vectorial damped wave equation

TL;DR

This paper extends the understanding of exponential energy decay in damped wave equations from scalar to vectorial cases on Riemannian manifolds, revealing new phenomena like high frequency overdamping and establishing conditions for strong stabilization.

Contribution

It generalizes Lebeau's decay rate formula to vectorial damped wave equations and introduces new phenomena and stabilization criteria in this broader setting.

Findings

Derived an explicit decay rate formula for vectorial damped wave equations.

Identified high frequency overdamping as a new phenomenon.

Established necessary and sufficient conditions for strong stabilization.

Abstract

The energy of solutions of the scalar damped wave equation decays uniformly exponentially fast when the geometric control condition is satisfied. A theorem of Lebeau [leb93] gives an expression of this exponential decay rate in terms of the average value of the damping terms along geodesics and of the spectrum of the infinitesimal generator of the equation. The aim of this text is to generalize this result in the setting of a vectorial damped wave equation on a Riemannian manifold with no boundary. We obtain an expression analogous to Lebeau's one but new phenomena like high frequency overdamping arise in comparison to the scalar setting. We also prove a necessary and sufficient condition for the strong stabilization of the vectorial wave equation.