Continuity of attractors for $\mathcal{C}^1$ perturbations of a smooth domain

Antônio L. Pereira

Published 2018-09-05Version 1

We consider a family of semilinear parabolic problems with nonlinear boundary conditions \[ \left\{ \begin{aligned} u_t(x,t)&=\Delta u(x,t) -au(x,t) + f(u(x,t)) ,\,\,\ x \in \Omega_\epsilon \,\,\,\mbox{and}\,\,\,\,\,\,t>0\,, \\ \displaystyle\frac{\partial u}{\partial N}(x,t)&=g(u(x,t)), \,\, x \in \partial\Omega_\epsilon \,\,\,\mbox{and}\,\,\,\,\,\,t>0\,, \end{aligned} \right. \] where $\Omega_0 \subset \R^n$ is a smooth (at least $\mathcal{C}^2$) domain , $\Omega_{\epsilon} = h_{\epsilon}(\Omega_0)$ and $h_{\epsilon}$ is a family of diffeomorphisms converging to the identity in the $\mathcal{C}^1$-norm. Assuming suitable regularity and dissipative conditions for the nonlinearites, we show that the problem is well posed for $\epsilon>0$ sufficiently small in a suitable scale of fractional spaces, the associated semigroup has a global attractor $\mathcal{A}_{\epsilon}$ and the family $\{\mathcal{A}_{\epsilon}\}$ is continuous at $\epsilon = 0$.