DOI: 10.68381/jca33019 ISSN: 0944-6532

On the Second Anisotropic Cheeger Constant and Related Questions

Gianpaolo Piscitelli

We study the behavior of the second eigenfunction of the anisotropic

p p
-Laplace operator
-\mathcal Q_{p}u:=-{\rm div} \left(F^{p-1}(\nabla u)F_\xi (\nabla u)\right), − Q p u : = − d i v ( F p − 1 ( ∇ u ) F ξ ( ∇ u ) ) ,
as
p \to 1^+ p → 1 +
, where
F F
is a suitable smooth norm of
\mathbb{R}^{n} R n
. Moreover, for any regular set
\Omega Ω
, 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\}, h 2 , F ( Ω ) : = inf ⁡ { max ⁡ { P F ( E 1 ) ∣ E 1 ∣ , P F ( E 2 ) ∣ E 2 ∣ } ,    E 1 , E 2 ⊂ Ω , E 1 ∩ E 2 = ∅ } ,
where
P_{F}(E) P F ( E )
is the anisotropic perimeter of
E E
, and study the connection with the second eigenvalue of the anisotropic
p p
-Laplacian. Finally, we study the twisted anisotropic
q q
-Cheeger constant with a volume constraint.