Abstract

Abstract We study integral operators L u ( χ ) = ∫ ℝ ℕ ψ ( u ( x ) − u ( y ) ) J ( x − y ) d y $\mathcal{L}u\left( \chi \right)=\int{_{_{\mathbb{R}}\mathbb{N}}\psi \left( u\left( x \right)-u\left( y \right) \right)J\left( x-y \right)dy}$ of the type of the fractional p-Laplacian operator, and the properties of the corresponding Orlicz and Sobolev-Orlicz spaces. In particular we show a Poincaré inequality and a Sobolev inequality, depending on the singularity at the origin of the kernel J considered, which may be very weak. Both inequalities lead to compact inclusions. We then use those properties to study the associated elliptic problem L u = f $\mathcal{L}u=f$ in a bounded domain Ω , $\Omega ,$ and boundary condition u ≡ 0 on Ω c ; ${{\Omega }^{c}};$ both cases f = f(x) and f = f(u) are considred, including the generalized eigenvalue problem f ( u ) = λ ψ ( u ) . $f\left( u \right)=\lambda \psi \left( u \right).$

Highlights

  • Un modelo de poblacionConsideremos una poblacion de individuos cuya densidad en cualquier punto x ∈ RN y tiempo t ≥ 0 estarepresentada por u(x, t)

  • The present thesis is dedicated to the study of certain integro-differential operators with differential order close to zero, which are interesting both, from the theoretical point of view and for the applications

  • In the second part we study nonlinear operators of the fractional p-Laplacian type, including weakly non-integrable kernels

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Summary

Introduction

Consideremos una poblacion de individuos cuya densidad en cualquier punto x ∈ RN y tiempo t ≥ 0 estarepresentada por u(x, t). Cuando el nucleo de Levy es una potencia no integrable, J(y) = |y|−N−α con 0 < α < 2, entonces el operador L es un multiplo del llamado laplaciano fraccionario (−∆)α/2u(x) = CN,αV.P. donde CN,α es una constante de normalizacion. Nuestro interes en esta parte de la tesis es estudiar operadores integrales del tipo p-laplaciano fraccionario para funciones Φ mas generales que solo potencias, ademas de considerar tambien nucleos en el lımite de integrabilidad. El Capıtulo 2 esta dedicada a estudiar el operador no local definido y la forma bilineal asociada, describiendo sus propiedades, incluyendo la accion del operador sobre diferentes funciones, dos desigualdades de Hardy y un resultado de simetrizacion para xx. Finalmente el Capıtulo 7 esta dedicado al estudio de los problemas elıpticos asociados para las diferentes reacciones comentadas anteriormente

Introduction and summary of results
Part I. Levy type operators in the limit of integrability
Part II. A nonlinear operator of fractional p-Laplacian type
Regularity properties
Estimates of the action of L on some functions
Symmetrization
Hardy inequalities
Chapter 3 The Sobolev spaces HJ
Compact embeddings in L2
Lorentz spaces
Existence of eigenvalues
Estimates of the eigenvalues
Existence
Regularity
Nonhomogeneous exterior datum
Neumann problem
Sublinear reaction
A NONLINEAR OPERATOR OF FRACTIONAL p-LAPLACIAN TYPE
The associated Orlicz spaces
Some useful inequalities
Basic properties
The Sobolev embedding
Compactness
The lower range
The intermediate range: subcritical reaction
Supercritical reaction
The generalized eigenvalue problem
Full Text
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