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On the strict convexity of the K-energy

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arxiv 1710.09075 v2 pith:IOGBGGTF submitted 2017-10-25 math.DG

classification math.DG
keywords k-energytoricautomorphismsconvexityexistsmabuchimanifoldminimizer
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Let (X,L) be a polarized projective complex manifold. We show, by a simple toric one-dimensional example, that Mabuchi's K-energy functional on the geodesically complete space of bounded positive (1,1)-forms in the first Chern class of L, endowed with the Mabuchi metric, is not strictly convex modulo automorphisms. However, under some further assumptions the strict convexity in question does hold in the toric case. This leads to a uniqueness result saying that a finite energy minimizer of the K-energy (which exists on any toric polarized manifold (X,L) which is uniformly K-stable) is uniquely determined modulo automorphisms under the assumption that there exists some minimizer with strictly positive curvature current.

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