Preprint
Inserted: 2 oct 2026
Last Updated: 14 oct 2026
Year: 2026
Abstract:
We establish a sharp comparison principle for the sharp-interface Ohta--Kawasaki energy and its Yukawa-screened counterpart in dimensions $2\le d\le 7$, for $m=0$, and under periodic and zero-flux Neumann boundary conditions. Whenever the finite optimal stripe width is compatible with the domain, we prove global minimality of periodic lamellae and characterize all minimizers. The proof combines radial comparison kernels, a sharp Fourier bound, and rigidity for a directional translation inequality in $BV$. The kernels are positive measures up to dimension five; in dimensions six and seven, distributional lifting and monotonicity of the averaged translation defect yield the same sharp comparison. In the Appendix, we also prove that no finite positive measure with the prescribed Fourier multiplier exists in dimensions $d\ge6$, and explain why the argument does not directly extend to $d \geq 8$.
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