On the Second Anisotropic Cheeger Constant and Related Questions

We study the behavior of the second eigenfunction of the anisotropic $p$-Laplace operator $$-\mathcal Q_{p}u:=-{\rm div} \left(F^{p-1}(\nabla u)F_\xi (\nabla u)\right),$$ as $p \to 1^+$, where $F$ is a suitable smooth norm of $\mathbb{R}^{n}$. Moreover, for any regular set $\Omega$, we define the second anisotropic Cheeger constant as $$h_{2,F}(\Omega):=\inf \left\{ \max\left\{\frac{P_{F}(E_{1})}{|E_{1}|},\frac{P_{F}(E_{2})}{|E_{2}|}\right\},\; E_{1},E_{2}\subset \Omega, E_{1}\cap E_{2}=\emptyset\right\},$$ where $P_{F}(E)$ is the anisotropic perimeter of $E$, and study the connection with the second eigenvalue of the anisotropic $p$-Laplacian. Finally, we study the twisted anisotropic $q$-Cheeger constant with a volume constraint.