Convexity of the extended K-energy and the large time behavior of the weak Calabi flow
| Autor: | Tamás Darvas, Robert J. Berman, Chinh H. Lu |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Mathematics - Differential Geometry
Pure mathematics Geodesic Kähler manifold Space (mathematics) 01 natural sciences Convexity 0103 physical sciences FOS: Mathematics Complex Variables (math.CV) 0101 mathematics Mathematics::Symplectic Geometry Mathematics Calabi flow Kähler metrics Mathematics - Complex Variables 32U05 010102 general mathematics 53C55 Metric space Differential Geometry (math.DG) Flow (mathematics) complex Monge–Ampère equations Metric (mathematics) 32W20 Mathematics::Differential Geometry 010307 mathematical physics Geometry and Topology |
| Zdroj: | Geom. Topol. 21, no. 5 (2017), 2945-2988 |
| ISSN: | 1364-0380 1465-3060 2945-2988 |
| Popis: | Let $(X,\omega)$ be a compact connected K\"ahler manifold and denote by $(\mathcal E^p,d_p)$ the metric completion of the space of K\"ahler potentials $\mathcal H_\omega$ with respect to the $L^p$-type path length metric $d_p$. First, we show that the natural analytic extension of the (twisted) Mabuchi K-energy to $\mathcal E^p$ is a $d_p$-lsc functional that is convex along finite energy geodesics. Second, following the program of J. Streets, we use this to study the asymptotics of the weak (twisted) Calabi flow inside the CAT(0) metric space $(\mathcal E^2,d_2)$. This flow exists for all times and coincides with the usual smooth (twisted) Calabi flow whenever the latter exists. We show that the weak (twisted) Calabi flow either diverges with respect to the $d_2$-metric or it $d_1$-converges to some minimizer of the K-energy inside $\mathcal E^2$. This gives the first concrete result about the long time convergence of this flow on general K\"ahler manifolds, partially confirming a conjecture of Donaldson. Finally, we investigate the possibility of constructing destabilizing geodesic rays asymptotic to diverging weak (twisted) Calabi trajectories, and give a result in the case when the twisting form is K\"ahler. If the twisting form is only smooth, we reduce this problem to a conjecture on the regularity of minimizers of the K-energy on $\mathcal E^1$, known to hold in case of Fano manifolds. Comment: v2. Introduction improved. Theorem 1.10 and Theorem 1.11 added. No further changes made |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|