Stabilization for the wave equation with singular Kelvin-Voigt damping

TL;DR

This paper investigates the stabilization of the wave equation with a singular Kelvin-Voigt damping located away from the boundary, demonstrating logarithmic energy decay using a frequency domain approach and Carleman estimates.

Contribution

It introduces a novel analysis of wave equation stabilization with damping far from the boundary, showing logarithmic decay where previous results indicated no uniform decay.

Findings

Energy decays logarithmically over time

Damping far from the boundary still stabilizes the wave

Frequency domain and Carleman estimate techniques are effective

Abstract

We consider the wave equation with Kelvin-Voigt damping in a bounded domain. The exponential stability result proposed by Liu and Rao or T\'ebou for that system assumes that the damping is localized in a neighborhood of the whole or a part of the boundary under some consideration. In this paper we propose to deal with this geometrical condition by considering a singular Kelvin-Voigt damping which is localized faraway from the boundary. In this particular case it was proved by Liu and Liu the lack of the uniform decay of the energy. However, we show that the energy of the wave equation decreases logarithmically to zero as time goes to infinity. Our method is based on the frequency domain method. The main feature of our contribution is to write the resolvent problem as a transmission system to which we apply a specific Carleman estimate.