Normalized solutions to 1-Laplace equations with critical growth term

Abstract: We study normalized solutions to the 1-Laplace equation [ -\mbox{div}\left(\frac{Du}{|Du|}\right)+λ\frac{u}{|u|}=f(u)+|u|^{1^*-2}u,\quad\mbox{in}~ \mathbb{R}^N ] subject to the constraint $\int_{\mathbb{R}^N}|u| \, \mbox{d}x=m$, where $N\geq2$, $1<sup>*=\frac{N}{N-1}$ is the critical Sobolev exponent for the embedding from BV into $L<sup>p$, $λ, m\in\mathbb{R}<sup>+$ and $f:\mathbb{R}\to\mathbb{R}$ is a continuous nonlinear perturbation. We first establish a Pohozaev-type identity for the equation and use it to study the associated critical energy, and then prove the existence of normalized solutions via nonsmooth critical point theory. A key feature of our approach is the proof of the existence of a Palais-Smale sequence for a Lipschitz continuous functional under a Lipschitz continuous constraint. This is significantly different in methodology from previous problems with $C<sup>2$ constraint.