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

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 $γ<-p$ we prove a lower bound for the Gamma-liminf of these functionals as $λ\to 0^+$ and a Poincaré