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We prove a product formula for $\delta$-invariant and as an application, we show that product of K-(semi, poly)stable Fano varieties is also K-(semi, poly)stable.

代数几何 · 数学 2021-02-22 Ziquan Zhuang

We give a survey of the recent progress on the study of K-stability of Fano varieties by an algebro-geometric approach.

代数几何 · 数学 2020-11-23 Chenyang Xu

We show that uniform K-stability is a Zariski open condition in Q-Gorenstein families of Q-Fano varieties. To prove this result, we consider the behavior of the stability threshold in families. The stability threshold (also known as the…

代数几何 · 数学 2020-06-11 Harold Blum , Yuchen Liu

We study K-stability of products of K-stable $\mathbb{Q}$-Fano varieties.

代数几何 · 数学 2016-10-18 Jihun Park , Joonyeong Won

We establish an algebraic approach to prove the properness of moduli spaces of K-polystable Fano varieties and reduce the problem to a conjecture on destabilizations of K-unstable Fano varieties. Specifically, we prove that if the stability…

代数几何 · 数学 2021-07-20 Harold Blum , Daniel Halpern-Leistner , Yuchen Liu , Chenyang Xu

We annnounce a proof of the fact that a K-stable Fano manifold admits a Kahler-Einstein metric and give a brief outline of the proof.

微分几何 · 数学 2012-10-30 Xiu-Xiong Chen , Simon Donaldson , Song Sun

We show that certain Galois covers of K-semistable Fano varieties are K-stable. We use this to give some new examples of Fano manifolds admitting K\"ahler-Einstein metrics, including hypersurfaces, double solids and threefolds.

代数几何 · 数学 2018-05-16 Ruadhaí Dervan

For any flat projective family $(\mX,\mL)\rightarrow C$ such that the generic fibre $\mX_\eta$ is a klt Q-Fano variety and $\mL|_{\mX_\eta}\sim_{Q}-K_{X_{\eta}}$, we use the techniques from the minimal model program (MMP) to modify the…

代数几何 · 数学 2013-10-15 Chi Li , Chenyang Xu

For Fano varieties, significant progress has been made recently in the study of $K$-stability, while the understanding of the weaker but more algebraic concept of $(-K)$-slope stability remains intricate. For instance, a conjecture…

代数几何 · 数学 2026-01-27 Yen-An Chen , Ching-Jui Lai

We study the K-stability of $\mathbb{Q}$-Fano spherical varieties using compatible divisors. More precisely, if the $\mathbb{Q}$-Fano variety, with a reductive group action, has an open Borel subgroup orbit, then there is a unique…

代数几何 · 数学 2026-01-05 Renpeng Zheng

We present some applications of the deformation theory of toric Fano varieties to K-(semi/poly)stability of Fano varieties. First, we present two examples of K-polystable toric Fano 3-fold with obstructed deformations. In one case, the…

代数几何 · 数学 2021-09-02 Anne-Sophie Kaloghiros , Andrea Petracci

Let $X$ be any $\mathbb{Q}$-Fano variety and $\mathrm{Aut}(X)_0$ be the identity component of the automorphism group of $X$. Let $\mathbb{G}$ be a connected reductive subgroup of $\mathrm{Aut}(X)_0$ that contains a maximal torus of…

微分几何 · 数学 2021-09-22 Chi Li

We present an elementary way of recovering a well-known criterion of K-stability for Fano reductive group compactifications.

代数几何 · 数学 2025-02-19 Gabriella Clemente

The purpose of this paper is to clarify all of the uniformly relatively Ding stable toric Fano threefolds and fourfolds as well as unstable ones. The key player in our classification result is the Mabuchi constants, which can be calculated…

微分几何 · 数学 2023-01-26 Yasufumi Nitta , Shunsuke Saito , Naoto Yotsutani

In this note, we discuss a number of open problems in K-stability theory.

代数几何 · 数学 2026-01-23 Chenyang Xu , Ziquan Zhuang

Let $X$ be a nonsingular complex projective toric variety. We address the question of semi-stability as well as stability for the tangent bundle $T{X}$. In particular, a complete answer is given when $X$ is a Fano toric variety of dimension…

代数几何 · 数学 2021-12-17 Indranil Biswas , Arijit Dey , Ozhan Genc , Mainak Poddar

We develop a framework to study the K-stability of weighted Fano hypersurfaces based on a combination of birational and convex-geometric techniques. As an application, we prove that all quasi-smooth weighted Fano hypersurfaces of index 1…

代数几何 · 数学 2026-01-07 Livia Campo , Kento Fujita , Taro Sano , Luca Tasin

We give a simple criterion for slope stability of Fano manifolds $X$ along divisors or smooth subvarieties. As an application, we show that $X$ is slope stable along an ample effective divisor $D\subset X$ unless $X$ is isomorphic to a…

代数几何 · 数学 2013-01-22 Kento Fujita

Fujita and Li have given a characterisation of K-stability of a Fano variety in terms of quantities associated to valuations, which has been essential to all recent progress in the area. We introduce a notion of valuative stability for…

代数几何 · 数学 2021-09-23 Ruadhaí Dervan , Eveline Legendre

In this paper, we directly prove that if the limit of microscopic stability thresholds introduced by Berman for a polarized manifold satisfies some condition, then there exists a unique constant scalar curvature K\"{a}hler metric. This is…

微分几何 · 数学 2024-10-30 Takahiro Aoi