The conjecture on local gradient control for continuously graded composites

Let SΩS\subset\Omega be an open set with closure contained in Ω\Omega. Consider continuously graded composites with inclusions having C1,αC^{1,\alpha} boundaries, and let Akj(x,nj)A^{k_j}(x,n_j) G-converge to AH(x)A^H(x). Let χkji(x,njx)\chi^i_{k_j}(x,n_jx) denote the characteristic function of the ii-th constituent and let uju_j and uHu^H be the corresponding solutions; write Mi(uH){\mathcal M}^i(\nabla u^H) for the associated effective field. Local gradient-control conjecture. One has

lim supjχkji(x,njx)ujL(S)=Mi(uH)L(S).\limsup_{j\to\infty}\|\chi^i_{k_j}(x,n_jx)\nabla u_j\|_{L^\infty(S)}=\|{\mathcal M}^i(\nabla u^H)\|_{L^\infty(S)}.

The conjecture asserts full, rather than merely almost-everywhere outside sets of vanishing measure, control of the local gradients in continuously graded composites with smooth inclusion boundaries. It is motivated by numerical simulations for smooth inclusions and by the homogenization identity, but the supplied text gives no resolution of the conjecture.

Sources & referencesView supporting material

Primary source

Robert Lipton and Tadele Mengesha, “Representation formulas for L^norms of weakly convergent sequences of gradient fields in homogenization”, arXiv:1009.4429 (2010).

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