Regularity of global attractors for beam equations with fractional damping and memory

This paper investigates the long-time behavior of a semilinear beam equation in a domain $\Omega \subset R^{n}$, with memory and fractional damping of the form $(-\Delta)^{\alpha}u_{t}$ ($\alpha \in [0,2]$ the dissipation index).

Two critical growth indices of the nonlinear term are determined for smooth and $C^2$ boundaries respectively, concerning the existence of the associated semigroup.

We prove the existence of global attractor for the semigroup by showing that it possesses a bounded absorbing set and asymptotic compactness.

Furthermore, we find out a new way to obtain, for all $\alpha$, higher regularities than anticipated for the attractors, and the regularity result indicates an interesting phenomenon that even much weaker damping can produce regularity that is infinitely close to that in the case of strong damping ($\alpha =2$).

As a consequence, our regularity result deepens and extends the existing related ones for the case when the memory is absent.