Calculus of Variations and Geometric Measure Theory
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N. Ikoma - A. Malchiodi - A. Mondino

Embedded area-constrained Willmore tori of small area in Riemannian three-manifolds II: Morse Theory

created by mondino on 17 Nov 2014
modified on 14 Sep 2016


American Journal of Mathematics

Inserted: 17 nov 2014
Last Updated: 14 sep 2016

Year: 2014


This is the second of a series of two papers where we construct embedded Willmore tori with small area constraint in Riemannian three-manifolds. In both papers the construction relies on a Lyapunov-Schmidt reduction, the difficulty being the M\"obius degeneration of the tori. In the first paper the construction was performed via minimization, here by Morse Theory; to this aim we establish new geometric expansions of the derivative of the Willmore functional on exponentiated small Clifford tori degenerating, under the action of the M\"obius group, to small geodesic spheres with a small handle. By using these sharp asymptotics we give sufficient conditions, in terms of the ambient curvature tensors and Morse inequalities, for having existence-multiplicity of embedded tori stationary for the Willmore functional under the constraint of prescribed (sufficiently small) area.


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