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Theses

K-stability and Kähler manifolds with transcendental cohomology class

Abstract : In this thesis we are interested in questions of geometric stability for constant scalar curvature Kähler (cscK) manifolds with transcendental cohomology class. As a starting point we develop generalized notions of K-stability, extending a classical picture for polarized manifolds due to G. Tian, S. Donaldson, and others, to the setting of arbitrary compact Kähler manifolds. We refer to these notions as cohomological K-stability. By contrast to the classical theory, this formalism allows us to treat stability questions for non-projective compact Kähler manifolds as well as projective manifolds endowed with non-rational polarizations. As a first main result and a fundamental tool in this thesis, we study subgeodesic rays associated to test configurations in our generalized sense, and establish formulas for the asymptotic slope of a certain family of energy functionals along these rays. This is related to the Deligne pairing construction in algebraic geometry, and covers many of the classical energy functionals in Kähler geometry (including Aubin's J-functional and the Mabuchi K-energy functional). In particular, this yields a natural potential-theoretic aproach to energy functional asymptotics in the theory of K-stability. Building on this foundation we establish a number of stability results for cscK manifolds: First, we show that cscK manifolds are K-semistable in our generalized sense, extending a result due to S. Donaldson in the projective setting. Assuming that the automorphism group is discrete we further show that K-stability is a necessary condition for existence of constant scalar curvature Kähler metrics on compact Kähler manifolds. More precisely, we prove that coercivity of the Mabuchi functional implies uniform K-stability, generalizing results of T. Mabuchi, J. Stoppa, R. Berman, R. Dervan as well as S. Boucksom, T. Hisamoto and M. Jonsson for polarized manifolds. This gives a new and more general proof of one direction of the Yau-Tian-Donaldson conjecture in this setting. The other direction (sufficiency of K-stability) is considered to be one of the most important open problems in Kähler geometry. We finally give some partial results in the case of compact Kähler manifolds admitting non-trivial holomorphic vector fields, discuss some further perspectives and applications of the theory of K-stability for compact Kähler manifolds with transcendental cohomology class, and ask some questions related to stability loci in the Kähler cone.
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Zakarias Sjöström Dyrefelt. K-stability and Kähler manifolds with transcendental cohomology class. General Mathematics [math.GM]. Université Paul Sabatier - Toulouse III, 2017. English. ⟨NNT : 2017TOU30126⟩. ⟨tel-01899546⟩

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