Continuity of attractors for $\mathcal{C}^1$ perturbations of a smooth domain (1809.01690v2)

Abstract: 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 $\Omega_0 \subset \mathbb{R}^n$ 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 $\epsilon = 0$.