Search arXiv⌕ Search

arXiv · 0706.0505

A note on the $K$-stability on toric manifolds

Abstract

In this note, we prove that on polarized toric manifolds the relative $K$-stability with respect to Donaldson's toric degenerations is a necessary condition for the existence of Calabi's extremal metrics, and also we show that the modified $K$-energy is proper in the space of $G_0$-invariant Kähler metrics for the case of toric surfaces which admit the extremal metrics.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Bin Zhou, Xiaohua Zhu. 2007-06-04. A note on the $K$-stability on toric manifolds. https://arxiv.org/abs/0706.0505

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

Height and distance-squared functions on implicit plane curves

We introduce families of Lagrange functions associated with height and distance-squared functions on implicit plane curves. We show that degeneracies of these families characterize geometric properties of the curves, such as inflections and vertices, and give geometric interpretations of the corresponding Lagrange multipliers in terms of contact with lines and circles.

math.DG↗

Minimal Surfaces in $\mathbb{R}^4$ with Three Planar Ends II: Symmetry and Nonexistence

In this paper, we study complete minimal surfaces in $\mathbb{R}^4$ with three embedded planar ends parallel to those of the union of the Lagrangian catenoid and the plane containing its waist circle. We prove that no such complete embedded minimal surface of genus $g\geq 2$ with finite total curvature admits at least $4(g+1)$ symmetries. This contrasts sharply with the genus-one case, where highly symmetric examples do exist and are uniquely determined up to scaling and rigid motion.

math.DG↗

Dirac eigenvalues and the hyper-hemispherical radius

On a connected compact Riemannian spin manifold with boundary, we prove an upper estimate for the smallest eigenvalue of the Dirac operator under the boundary condition associated with a chirality operator. This upper bound is expressed in terms of the hyper-hemispherical radius. Moreover, the upper bound is realized if and only if the manifold is a hemisphere. As an application, we get a scalar curvature rigidity result for the hemisphere in the case of Lipschitz maps whose differential has a prescribed trace-norm bound. Our estimate extends Bär's result for closed manifolds, where the upper bound is given in terms of hyperspherical radius.

math.DG↗