Area Variations Under Legendrian Constraint

Tristan Rivière

Peking Mathematical Journal ›› 2026, Vol. 9 ›› Issue (2) : 293 -399.

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Peking Mathematical Journal ›› 2026, Vol. 9 ›› Issue (2) :293 -399. DOI: 10.1007/s42543-024-00090-y
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Area Variations Under Legendrian Constraint
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Abstract

In any 5-dimensional closed Sasakian manifold, we prove that any minmax operation on the area among Legendrian surfaces is achieved by a continuous conformal Legendrian map from a closed Riemann surface S into $N^5$ equipped with an integer multiplicity bounded in $L^\infty $. Moreover this map, equipped with this multiplicity, satisfies a weak version of the Hamiltonian Minimal Equation. We conjecture that any solution to this equation is a smooth branched Legendrian immersion away from isolated Schoen–Wolfson conical singularities with non-zero Maslov class.

Keywords

Hamiltonian minimal surfaces / Legendrian surfaces / Minmax / Sasakian manifolds / 53D12 / 49Q05 / 53A10 / 58E12 / 49Q10

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Tristan Rivière. Area Variations Under Legendrian Constraint. Peking Mathematical Journal, 2026, 9(2): 293-399 DOI:10.1007/s42543-024-00090-y

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Swiss Federal Institute of Technology Zurich

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