The MGT-Fourier model in the supercritical case

TL;DR

This paper investigates the energy transfer and stability in a coupled Moore-Gibson-Thompson and heat equation system in the supercritical regime, demonstrating exponential stability under strong coupling conditions.

Contribution

It provides a detailed analysis of the asymptotic behavior and stability of the supercritical MGT-heat system, highlighting the role of coupling strength in energy decay.

Findings

Exponential stability is achieved with sufficiently large coupling.

The system's decay rate cannot be optimized solely through energy estimates.

The coupling strength determines the dominance of damping or antidamping effects.

Abstract

We address the energy transfer in the differential system $$ \begin{cases} u_{ttt}+\alpha u_{tt} - \beta \Delta u_t - \gamma \Delta u = -\eta \Delta \theta \\ \theta_t - \kappa \Delta \theta =\eta \Delta u_{tt}+ \alpha\eta \Delta u_t \end{cases} $$ made by a Moore-Gibson-Thompson equation in the supercritical regime, hence antidissipative, coupled with the classical heat equation. The asymptotic properties of the related solution semigroup depend on the strength of the coupling, ruling the competition between the Fourier damping and the MGT antidamping. Exponential stability will be shown always to occur, provided that the coupling constant is sufficiently large with respect to the other structural parameters. A fact of general interest will be also discussed, namely, the impossibility of attaining the optimal exponential decay rate of a given dissipative system via energy estimates.