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

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Let h∈[0,1)h\in[0,1), let d∈N={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.

References

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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