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Journal Articles Journal of the Institute of Mathematics of Jussieu Year : 2023

Compactness and structure of zero-states for unoriented Aviles-Giga functionals

Abstract

Motivated by some models of pattern formation involving an unoriented director field in the plane, we study a family of unoriented counterparts to the Aviles-Giga functional. We introduce a nonlinear curl operator for such unoriented vector fields as well as a family of even entropies which we call "trigonometric entropies". Using these tools we show two main theorems which parallel some results in the literature on the classical Aviles-Giga energy. The first is a compactness result for sequences of configurations with uniformly bounded energies. The second is a complete characterization of zero-states, that is, the limit configurations when the energies go to 0. These are Lipschitz continuous away from a locally finite set of points, near which they form either a vortex pattern or a disclination with degree 1/2. The proof is based on a combination of regularity theory together with techniques coming from the study of the Ginzburg-Landau energy. Our methods provide alternative proofs in the classical Aviles-Giga context.
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Dates and versions

hal-03472756 , version 1 (10-12-2021)

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Michael Goldman, Benoît Merlet, Marc Pegon, Sylvia Serfaty. Compactness and structure of zero-states for unoriented Aviles-Giga functionals. Journal of the Institute of Mathematics of Jussieu, In press, pp.1-42. ⟨10.1017/S1474748023000075⟩. ⟨hal-03472756⟩
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