Long-time behaviour for a non-autonomous Klein-Gordon-Zakharov system

• Main Authors: Bonotto, Everaldo de Mello, Nascimento, Marcelo José Dias, Santiago, Eric Busatto
• Format: Journal Article
• Language: English
• Published: 18.05.2021
• Subjects: Mathematics - Dynamical Systems
• DOI: 10.48550/arxiv.2105.08861

The aim of this paper is to study the long-time dynamics of solutions of the evolution system \[ \begin{cases} u_{tt} - \Delta u + u + \eta(-\Delta)^{\frac{1}{2}}u_t + a_{\epsilon}(t)(-\Delta)^{\frac{1}{2}}v_t = f(u), & \; (x, t) ın \Omega \times (\tau, ınfty), \\ v_{tt} - \Delta v + \eta(-\Delta)^{\frac{1}{2}}v_t - a_{\epsilon}(t)(-\Delta)^{\frac{1}{2}}u_t = 0, & \; (x, t) ın \Omega \times (\tau, ınfty), \end{cases} \] subject to boundary conditions \[ u = v = 0, \;\; (x, t)ın \partial\Omega\times (\tau, ınfty), \] where $\Omega$ is a bounded smooth domain in $\mathbb{R}^n$, $n \geq 3$, with the boundary $\partial\Omega$ assumed to be regular enough, $\eta > 0$ is constant, $a_{\epsilon}$ is a Hölder continuous function and $f$ is a dissipative nonlinearity. This problem is a non-autonomous version of the well known Klein-Gordon-Zakharov system. Using the uniform sectorial operators theory, we will show the local and global well-posedness of this problem in $H_0^1(\Omega) \times L^2(\Omega) \times H_0^1(\Omega) \times L^2(\Omega)$. Additionally, we prove existence, regularity and upper semicontinuity of pullback attractors.