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We introduce a notion of K-stability for adjoint foliated structures via test configurations and the foliated Donaldson-Futaki invariant. We prove reduction to special test configurations for adjoint Fano foliated structures by showing that…

代数几何 · 数学 2026-05-22 Theodoros Stylianos Papazachariou

We define G-pseudovaluations on a variety with a group action G. By introducing G-pseudovaluations, we are able to give some criteria for G-equivariant K-stability of Fano varieties which are parallel to existing results for usual…

代数几何 · 数学 2020-07-31 Ziwen Zhu

Ross and Thomas introduced the concept of slope stability to study K-stability, which has conjectural relation with the existence of constant scalar curvature K\"ahler metric. This paper presents a study of slope stability of Fano manifolds…

代数几何 · 数学 2014-02-26 Jun-Muk Hwang , Hosung Kim , Yongnam Lee , Jihun Park

Given a Fano manifold $(X,\omega)$ we develop a variational approach to characterize analytically the existence of K\"ahler-Einstein metrics with prescribed singularities, assuming that these singularities can be approximated algebraically.…

微分几何 · 数学 2023-09-21 Antonio Trusiani

We prove that every smooth Fano complete intersection of index $1$ and codimension $r$ in $\mathbb{P}^{n+r}$ is birationally superrigid and K-stable if $n\ge 10r$. We also propose a generalization of Tian's criterion of K-stability and, as…

代数几何 · 数学 2021-02-22 Ziquan Zhuang

We study K-stability of smooth Fano threefolds of Picard rank $2$ and degree $22$ which can be obtained by blowing up a smooth complete intersection of two quadrics in $\mathbb{P}^5$ along a conic. We also describe the automorphism groups…

We prove that all general smooth Fano threefolds of Picard rank $3$ and degree $14$ are K-stable, where the generality condition is stated explicitly.

代数几何 · 数学 2024-05-22 Grigory Belousov , Konstantin Loginov

We prove that all smooth Fano threefolds of rank 4 and degree 24 are K-stable.

代数几何 · 数学 2022-06-27 Grigory Belousov , Konstantin Loginov

It's well-known that adding a general boundary would create K-stability. As an application, we reprove product theorem for delta invariants of Fano varieties.

代数几何 · 数学 2025-01-06 Chuyu Zhou

In this paper we consider spectral extremal problems for hypergraphs. We give two general criteria under which such results may be deduced from `strong stability' forms of the corresponding (pure) extremal results. These results hold for…

组合数学 · 数学 2014-03-07 Peter Keevash , John Lenz , Dhruv Mubayi

We give a classification of Gorenstein Fano bi-equivariant compactifications of semisimple complex Lie groups with rank two, and determine which of them are equivariant K-stable and admit (singular) K\"{a}hler-Einstein metrics. As a…

微分几何 · 数学 2023-07-06 Jae-Hyouk Lee , Kyeong-Dong Park , Sungmin Yoo

Let k be an uncountable algebraically closed field and let Y be a smooth projective k-variety which does not admit a decomposition of the diagonal. We prove that Y is not stably birational to a very general hypersurface of any given degree…

代数几何 · 数学 2023-06-22 Stefan Schreieder

We prove that all smooth Fano threefolds in the families 2.1, 2.2, 2.3, 2.4, 2.6 and 2.7 are K-stable, and we also prove that smooth Fano threefolds in the family 2.5 that satisfy one very explicit generality condition are K-stable.

代数几何 · 数学 2024-01-17 Ivan Cheltsov , Elena Denisova , Kento Fujita

We show that if a Fano manifold $M$ is K-stable with respect to special degenerations equivariant under a compact group of automorphisms, then $M$ admits a K\"ahler-Einstein metric. This is a strengthening of the solution of the…

微分几何 · 数学 2015-06-25 Ved Datar , Gábor Székelyhidi

Using the Abban-Zhuang theory and the classification of three-dimensional log smooth log Fano pairs due to Maeda, we prove that threefold log Fano pairs $(X, D)$ of Maeda type with reducible boundary $D$ are K-unstable, with four…

代数几何 · 数学 2023-02-10 Konstantin Loginov

We study Fano threefolds that can be obtained by blowing up the three-dimensional projective space along a smooth curve of degree six and genus three. We produce many new K-stable examples of such threefolds, and we describe all finite…

代数几何 · 数学 2024-04-12 Ivan Cheltsov , Oliver Li , Sione Ma'u , Antoine Pinardin

We define a new notion of "b-stability" for a polarised algebraic variety, adapted to the existence problem for Kahler-Einstein metrics on Fano manifolds.

微分几何 · 数学 2010-07-27 Simon Donaldson

We prove the $K$-polystability of all smooth complex Fano threefolds admitting an effective action of $\text{SL}_2$ but not of a 2-torus or 3-torus. In particular, the existence of K\"{a}hler-Einstein metrics on varieties in the families…

代数几何 · 数学 2022-01-12 Jack Rogers

We study the K-stability of singular Fano 3-folds with canonical Gorenstein singularities whose anticanonical linear system is base-point-free but not very ample.

The notion of asymptotically log Fano varieties was given by Cheltsov and Rubinstein. We show that, if an asymptotically log Fano variety $(X, D)$ satisfies that $D$ is irreducible and $-K_X-D$ is big, then $X$ does not admit…

代数几何 · 数学 2015-09-10 Kento Fujita