Rigidity in the Ginzburg–Landau equation from S2 to S2

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• Matilde Gianocca, ETH
• Monday 27 October 2025, 14:00-15:00
• Lecture Room 2 in the gatehouse at INI.

If you have a question about this talk, please contact Zoe Wyatt.

The Ginzburg–Landau energy is often used to approximate the Dirichlet energy. As the perturbation parameter tends to zero, critical points of the Ginzburg–Landau energy converge, in an appropriate (bubbling) sense, to harmonic maps. In this talk I will first explain key analytical properties of this approximation procedure, then show that not every harmonic map can be approximated in this way. This is based on a rigidity theorem: under the energy threshold of 8pi, we classify all solutions of the associated nonlinear elliptic system from S2 to S2, thereby identifying exactly which harmonic maps can arise as Ginzburg–Landau limits in this regime.

This talk is part of the Geometric Analysis & Partial Differential Equations seminar series.

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