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Mabuchi Solitons and Relative Ding Stability of Toric Fano Varieties

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arxiv 1701.04016 v4 pith:Y7GG2IFI submitted 2017-01-15 math.DG

classification math.DG
keywords casedingfanomabuchisolitonsstabilitycalabi-typeenergy
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As a generalization of Kahler-Einstein metrics for Fano manifolds with nonvanishing Futaki invariant, Mabuchi solitons are critical points of a Calabi-type energy functional. We study their existence on toric Fano varieties and the underlying algebraic stability notion: relative Ding stability. As a toy model for a YTD type correspondence, a new feature is the emergence of a non-uniformly stable case. We show a partial coercivity for the modified Ding functionals in this case, and obtain singular Mabuchi solitons via a variational approach. In the unstable case, we determine the maximal destabilizer which is a simple convex function over the moment polytope, and establish a Moment-Weight equality which connects the infimum of a Calabi-type energy and the Berman-Ding invariant.

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