Nonattainment conjecture for Néel-wall energies at winding numbers d and d plus alpha over pi

Let h[0,1)h\in[0,1), let dN={1,2,}d\in\mathbb{N}=\{1,2,\dots\}, and let Eh(w)\mathcal{E}_h(w) denote the infimum of the energy among profiles with winding number ww. Nonattainment conjecture. Neither Eh(d)\mathcal{E}_h(d) nor Eh(d+α/π)\mathcal{E}_h(d+\alpha/\pi) is attained. This concerns the cases not covered by the existence results; the preceding discussion identifies escape of walls to infinity as the possible source of noncompactness, but no proof is known here.

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Primary source

Radu Ignat and Roger Moser, “Néel walls with prescribed winding number and how a nonlocal term can change the energy landscape”, arXiv:1608.06975 (2016).

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