A variational essential spectrum is defined for the p-Laplacian with Persson's theorem extended to characterize its bottom geometrically using the L^p Poincaré constant at infinity.
Brasco, On principal frequencies and isoperimetric ratios in convex sets, Ann
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Essential spectrum for the $p-$Laplacian
A variational essential spectrum is defined for the p-Laplacian with Persson's theorem extended to characterize its bottom geometrically using the L^p Poincaré constant at infinity.