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The nonclassical diffusion equations with time-dependent memory kernels and a new class of nonlinearities
Published online by Cambridge University Press: 21 February 2022
Abstract
In this study, we consider the nonclassical diffusion equations with time-dependent memory kernels
\begin{equation*} u_{t} - \Delta u_t - \Delta u - \int_0^\infty k^{\prime}_{t}(s) \Delta u(t-s) ds + f( u) = g \end{equation*}
$\Omega \subset \mathbb{R}^N,\, N\geq 3$
. Firstly, we study the existence and uniqueness of weak solutions and then, we investigate the existence of the time-dependent global attractors
$\mathcal{A}=\{A_t\}_{t\in\mathbb{R}}$
in
$H_0^1(\Omega)\times L^2_{\mu_t}(\mathbb{R}^+,H_0^1(\Omega))$
. Finally, we prove that the asymptotic dynamics of our problem, when
$k_t$
approaches a multiple
$m\delta_0$
of the Dirac mass at zero as
$t\to \infty$
, is close to the one of its formal limit
\begin{equation*}u_{t} - \Delta u_{t} - (1+m)\Delta u + f( u) = g. \end{equation*}
$k_t(\!\cdot\!)$
depends on time, which allows for instance to describe the dynamics of aging materials.
MSC classification
- Type
- Research Article
- Information
- Copyright
- © The Author(s), 2022. Published by Cambridge University Press on behalf of Glasgow Mathematical Journal Trust
References
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