Abstract
In this paper we study the limit, in the sense of the Γ-convergence, of sequences of two-dimensional energies of the type \({\int_\Omega A_n\nabla u\cdot\nabla u\,dx+\int_\Omega u^2d\mu_n}\), where A n is a symmetric positive definite matrix-valued function and μ n is a nonnegative Borel measure (which can take infinite values on compact sets). Under the sole equicoerciveness of A n we prove that the limit energy belongs to the same class, i.e. its reads as \({\hat F(u)+\int_\Omega u^2d\mu}\), where \({\hat F}\) is a diffusion independent of μ n and μ is a nonnegative Borel measure which does depend on \({\hat F}\) . This compactness result extends in dimension two the ones of [11,23] in which A n is assumed to be uniformly bounded. It is also based on the compactness result of [7] obtained for sequences of two-dimensional diffusions (without zero-order term). Our result does not hold in dimension three or greater, since nonlocal effects may appear. However, restricting ourselves to three-dimensional diffusions with matrix-valued functions only depending on two coordinates, the previous two-dimensional result provides a new approach of the nonlocal effects. So, in the periodic case we obtain an explicit formula for the limit energy specifying the kernel of the nonlocal term.
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Briane, M., Casado–Díaz, J. Compactness of sequences of two-dimensional energies with a zero-order term. Application to three-dimensional nonlocal effects. Calc. Var. 33, 463–492 (2008). https://doi.org/10.1007/s00526-008-0171-8
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DOI: https://doi.org/10.1007/s00526-008-0171-8