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This is the first of a sequence of two papers. Here, a simple algebraic characterization of the Fano manifolds in the class of homogeneous toric bundles over a flag manifold G^C/P is provided in terms of symplectic data. The result of this…

Differential Geometry · Mathematics 2007-05-23 Fabio Podesta' , Andrea Spiro

A simple algebraic characterization of the Fano manifolds in the class of homogeneous toric bundles over a flag manifold $G^C/P$ is provided in terms of symplectic data.

Differential Geometry · Mathematics 2007-05-23 Fabio Podesta' , Andrea Spiro

Assume that $X$ is a homogeneous toric bundle of the form $G^{\mathbb{C}}\times_{P,\tau} F$ and is Fano, where $G$ is a compact semisimple Lie group with complexification $G^\mathbb{C}$, $P$ a parabolic subgroup of $G^\mathbb{C}$,…

Differential Geometry · Mathematics 2020-01-01 Hong Huang

A short proof of the convergence of the Kahler-Ricci flow on Fano manifolds admitting a Kahler-Einstein metric or a Kahler-Ricci soliton is given, using a variety of recent techniques

Differential Geometry · Mathematics 2020-01-20 Bin Guo , Duong H. Phong , Jacob Sturm

We prove a necessary and sufficient condition in terms of the barycenters of a collection of polytopes for existence of coupled K\"ahler-Einstein metrics on toric Fano manifolds. This confirms the toric case of a coupled version of the…

Differential Geometry · Mathematics 2019-10-30 Jakob Hultgren

We consider Fano manifolds admitting an algebraic torus action with general orbit of codimension one. Using a recent result of Datar and Szekelyhidi, we effectively determine the existence of Kahler-Ricci solitons for those manifolds via…

Algebraic Geometry · Mathematics 2022-05-20 Nathan Ilten , Hendrik Süß

In this paper, we establish several sufficient and necessary conditions for the convergence of a K\"ahler-Ricci flow, on a K\"ahler manifold with positive first Chern class, to a K\"ahler-Einstein metric (or a shrinking K\"ahler-Ricci…

Differential Geometry · Mathematics 2010-11-09 Zhenlei Zhang

We consider the K\"ahler-Ricci flow on a Fano manifold. We show that if the curvature remains uniformly bounded along the flow, the Mabuchi energy is bounded below, and the manifold is K-polystable, then the manifold admits a…

Differential Geometry · Mathematics 2011-01-27 Gábor Székelyhidi

For Fano homogeneous toric bundles, we obtain a formula of the greatest lower bound on Ricci curvature. We also give a criteria for the ampleness of a kind of line bundles over general homogeneous toric bundles.

Differential Geometry · Mathematics 2016-08-30 Yi Yao

We show that a K\"ahler-Ricci soliton on a Fano manifold can always be smoothly approximated by a sequence of relative anticanonically balanced metrics, also called quantized K\"ahler-Ricci solitons. The proof uses a semiclassical estimate…

Differential Geometry · Mathematics 2022-04-27 Louis Ioos

For $\phi$ a metric on the anticanonical bundle, $-K_X$, of a Fano manifold $X$ we consider the volume of $X$ $$ \int_X e^{-\phi}. $$ We prove that the logarithm of the volume is concave along bounded geodesics in the space of positively…

Differential Geometry · Mathematics 2015-04-17 Bo Berndtsson

In this short note, we prove that a Calabi extremal Kaehler-Ricci soliton on a compact toric Kaehler manifold is Einstein. This solves for the class of toric manifolds a general problem stated by the authors that they solved only under some…

Differential Geometry · Mathematics 2017-09-06 Simone Calamai , David Petrecca

This is an expository article. Among other topics, we discuss the existence of Kahler-Ricci soliton metrics on toric Fano manifolds, and Kahler-Einstein metrics on deformations of the Mukai-Umemura 3-fold

Differential Geometry · Mathematics 2008-04-14 S. K. Donaldson

Using Hultgren's polytope formulation of the existence of coupled K\"ahler-Einstein (cKE) metrics on toric Fano manifolds, we construct explicit higher-dimensional toric Fano manifolds that admit two coupled K\"ahler-Einstein metrics but no…

Differential Geometry · Mathematics 2026-02-25 Naoto Yotsutani

We examine various examples of horosymmetric manifolds which exhibit interesting properties with respect to canonical metrics. In particular, we determine when the blow-up of a quadric along a linear subquadric admits K\"ahler-Einstein…

Differential Geometry · Mathematics 2022-11-03 Thibaut Delcroix

In this short paper, we improve the result of Phong-Song-Sturm on degeneration of Fano K\"ahler-Ricci solitons by removing the assumption on the uniform bound of the Futaki invariant. Let $\mathcal{KR}(n)$ be the space of K\"ahler-Ricci…

Differential Geometry · Mathematics 2018-05-09 Bin Guo , Duong H. Phong , Jian Song , Jacob Sturm

By extending Koiso's examples to the non-compact case, we construct complete gradient Kahler-Ricci solitons of various types on certain holomorphic line bundles over compact Kahler-Einstein manifolds. Moreover, a uniformization result on…

Differential Geometry · Mathematics 2008-02-05 Bo Yang

We prove the existence of K\"ahler-Ricci solitons on toric Fano orbifolds, hence extend the the theorem of Wang and Zhu [WZ] to the orbifold case.

Differential Geometry · Mathematics 2011-02-15 Yalong Shi , Xiaohua Zhu

In this paper, we study the stability of the conical K\"ahler-Ricci flows on Fano manifolds. That is, if there exists a conical K\"ahler-Einstein metric with cone angle $2\pi\beta$ along the divisor, then for any $\beta'$ sufficiently close…

Differential Geometry · Mathematics 2019-04-17 Jiawei Liu , Xi Zhang

We analyse some properties of the cohomogeneity one Ricci soliton equations, and use Ansatze of cohomogeneity one type to produce new explicit examples of complete Kahler Ricci solitons of expanding, steady and shrinking types. These…

Differential Geometry · Mathematics 2008-02-07 Andrew S. Dancer , Mckenzie Y. Wang
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