Lower bounds and Poincaré inequality for the Brezis-Seeger-Van Schaftingen-Yung functionals

Abstract: We consider a family of non-local and non-convex functionals depending on three real parameters $(γ,p,λ)$, which was introduced by H. Brezis, A. Seeger, J. Van Schaftingen and P. L. Yung. In the case $γ&lt;-p$ we prove a lower bound for the Gamma-liminf of these functionals as $λ\to 0<sup>+$ and a Poincaré-type inequality. We also show that such inequality cannot hold if $γ&gt;0$, and we establish a modified version in this case. These results answer some open questions posed by these authors and by H. M. Nguyen.