Inserted: 19 may 2021
Last Updated: 19 may 2021
We consider the torsional rigidity and the principal eigenvalue related to the $p$-Laplace operator. The goal is to find upper and lower bounds to products of suitable powers of the quantities above in various classes of domains. The limit cases $p=1$ and $p=\infty$ are also analyzed, which amount to consider the Cheeger constant of a domain and functionals involving the distance function from the boundary.
Keywords: shape optimization, Torsional rigidity, Convex domains, principal eigenvalue, Cheeger constant