Two-dimensional curvature functionals with superquadratic growth

TL;DR

This paper proves smoothness and compactness results for critical points of two-dimensional curvature functionals with superquadratic growth, extending classical theorems and establishing Palais-Smale conditions.

Contribution

It demonstrates that $W^{2,p}$ critical points of these curvature functionals are smooth and provides compactness theorems, including a new bound for the Willmore energy.

Findings

Critical points are smooth for $p > 2$.

Compactness holds under energy bounds, extending Langer's theorem.

Palais-Smale conditions are established for the functionals.

Abstract

For two-dimensional, immersed closed surfaces $f:\Sigma \to \R^n$, we study the curvature functionals $\mathcal{E}^p(f)$ and $\mathcal{W}^p(f)$ with integrands $(1+|A|^2)^{p/2}$ and $(1+|H|^2)^{p/2}$, respectively. Here $A$ is the second fundamental form, $H$ is the mean curvature and we assume $p > 2$. Our main result asserts that $W^{2,p}$ critical points are smooth in both cases. We also prove a compactness theorem for $\mathcal{W}^p$-bounded sequences. In the case of $\mathcal{E}^p$ this is just Langer's theorem \cite{langer85}, while for $\mathcal{W}^p$ we have to impose a bound for the Willmore energy strictly below $8\pi$ as an additional condition. Finally, we establish versions of the Palais-Smale condition for both functionals.