One-dimensional symmetry of periodic minimizers for a mean field equation
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 5, Tome 6 (2007) no. 2, pp. 269-290.

We consider on a two-dimensional flat torus T defined by a rectangular periodic cell the following equation

Δu+ρe u T e u -1 |T|=0, T u=0.
It is well-known that the associated energy functional admits a minimizer for each ρ8π. The present paper shows that these minimizers depend actually only on one variable. As a consequence, setting λ 1 (T) to be the first eigenvalue of the Laplacian on the torus, the minimizers are identically zero whenever ρmin{8π,λ 1 (T)|T|}. Our results hold more generally for solutions that are Steiner symmetric, up to a translation.

Classification : 35J60, 35B10
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     title = {One-dimensional symmetry of periodic minimizers for a mean field equation},
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Lin, Chang-Shou; Lucia, Marcello. One-dimensional symmetry of periodic minimizers for a mean field equation. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 5, Tome 6 (2007) no. 2, pp. 269-290. http://www.numdam.org/item/ASNSP_2007_5_6_2_269_0/

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