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The geometrical quantity in damped wave equations on a square

Pascal HébrardEmmanuel Humbert — 2006

ESAIM: Control, Optimisation and Calculus of Variations

The energy in a square membrane subject to constant viscous damping on a subset ω Ω decays exponentially in time as soon as satisfies a geometrical condition known as the “Bardos-Lebeau-Rauch” condition. The rate τ ( ω ) of this decay satisfies τ ( ω ) = 2 min ( - μ ( ω ) , g ( ω ) ) (see Lebeau [ (1996) 73–109]). Here μ ( ω ) denotes the spectral abscissa of the damped wave equation operator and  g ( ω ) is a number called the geometrical quantity of and defined as follows. A ray in is the trajectory generated by the free motion of...

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