Displaying similar documents to “Non-local approximation of free-discontinuity problems with linear growth”

A relaxation result for energies defined on pairs set-function and applications

Andrea Braides, Antonin Chambolle, Margherita Solci (2007)

ESAIM: Control, Optimisation and Calculus of Variations

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We consider, in an open subset of ℝ N , energies depending on the perimeter of a subset E ⊂ Ω (or some equivalent surface integral) and on a function which is defined only on Ω ∖ E . We compute the lower semicontinuous envelope of such energies. This relaxation has to take into account the fact that in the limit, the “holes” may collapse into a discontinuity of , whose surface will be counted twice in the relaxed energy. We discuss some situations where such energies appear, and give, as an...

Integral representation and Γ -convergence of variational integrals with p ( x ) -growth

Alessandra Coscia, Domenico Mucci (2002)

ESAIM: Control, Optimisation and Calculus of Variations

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We study the integral representation properties of limits of sequences of integral functionals like ∫ f ( x , D u ) d x under nonstandard growth conditions of ( p , q ) -type: namely, we assume that | z | p ( x ) ≤ f ( x , z ) ≤ L ( 1 + | z | p ( x ) ) . Under weak assumptions on the continuous function p ( x ) , we prove Γ -convergence to integral functionals of the same type. We also analyse the case of integrands f ( x , u , D u ) depending explicitly on u ; finally we weaken the assumption allowing p ( x ) to be discontinuous on nice sets.

Upper bounds for a class of energies containing a non-local term

Arkady Poliakovsky (2010)

ESAIM: Control, Optimisation and Calculus of Variations

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In this paper we construct upper bounds for families of functionals of the form E ε ( φ ) : = ∫ Ω ε | ∇ φ | 2 + 1 ε W ( φ ) d x + 1 ε ∫ ℝ N | ∇ H ¯ F ( φ ) | 2 d x where Δ H ¯ u = div { χ Ω u}. Particular cases of such functionals arise in Micromagnetics. We also use our technique to construct upper bounds for functionals that appear in a variational formulation of the method of vanishing viscosity for conservation laws.

Homogenization of micromagnetics large bodies

Giovanni Pisante (2004)

ESAIM: Control, Optimisation and Calculus of Variations

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A homogenization problem related to the micromagnetic energy functional is studied. In particular, the existence of the integral representation for the homogenized limit of a family of energies ℰ ε ( m ) = ∫ Ω φ x , x ε , m ( x ) d x - ∫ Ω h e ( x ) · m ( x ) d x + 1 2 ∫ ℝ 3 | ∇ u ( x ) | 2 d x of a large ferromagnetic body is obtained.