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NCTS Differential Geometry Seminar
15:00 - 16:00, June 19, 2019 (Wednesday)
Room 201, Astronomy-Mathematics Building, NTU
(台灣大學天文數學館 201室)
Morse Index Bound of Min-max 2 Spheres
Yuchin Sun (University of California, Santa Cruz)


Finite-dimensional Morse theory was developed to study geodesics. Index of a critical point of a Morse function reflects its topology. A natural extension of finite-dimensional Morse theory will be a Morse theory for harmonic spheres. We prove that given a Riemannian manifold of dimension at least three, with a generic metric and nontrivial homotopy group , there exists a collection of finitely many harmonic spheres whose sum of areas realizes the width with Morse index bound one. Moreover, under the assumption of strong convergence the Morse index conjecture is true.


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