English
Related papers

Related papers: On smooth Fano threefolds with coregularity zero

200 papers

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…

Algebraic Geometry · Mathematics 2024-04-12 Ivan Cheltsov , Oliver Li , Sione Ma'u , Antoine Pinardin

We give conditions for a uniruled variety of dimension at least 2 to be non-solid. This study provides further evidence to a conjecture by Abban and Okada on the solidity of Fano 3-folds. To complement our results we write explicit…

Algebraic Geometry · Mathematics 2023-07-07 Livia Campo , Tiago Duarte Guerreiro

The elliptic curves on a surface of general type constitute an obstruction for the cotangent sheaf to be ample. In this paper, we give the classification of the configurations of the elliptic curves on the Fano surface of a smooth cubic…

Algebraic Geometry · Mathematics 2010-01-27 Xavier Roulleau

We solve the infinitesimal Torelli problem for $3$-dimensional quasi-smooth ${\mathbb{Q}}$-Fano hypersurfaces with at worst terminal singularities. We also find infinite chains of double coverings of increasing dimension which alternatively…

Algebraic Geometry · Mathematics 2019-02-15 Enrico Fatighenti , Luca Rizzi , Francesco Zucconi

In our previous research, we constructed the affine varieties $\Sigma_{\mathbb{A}}^{13}$ and $\Pi_{\mathbb{A}}^{14}$ whose partial projectivizations admit $\mathbb{P}^{2}\times\mathbb{P}^{2}$-fibrations with relative Picard number one. In…

Algebraic Geometry · Mathematics 2025-11-03 Hiromichi Takagi

In a work of Costa and Mir\'{o}-Roig state the following conjecture: Every smooth complete toric Fano variety has a full strongly exceptional collection of line bundles. The goal of this article is to prove it for toric Fano 3-folds.

Algebraic Geometry · Mathematics 2010-12-30 Alessandro Bernardi , Sofia Tirabassi

The paper is dedicated to the study of algebraic manifolds whose quantum cohomology or a part of it is a semisimple Frobenius manifold. Theorem 1.8.1 says, roughly speaking, that the sum of $(p,p)$--cohomology spaces is a maximal Frobenius…

Algebraic Geometry · Mathematics 2012-04-06 Arend Bayer , Yuri Manin

In this article we exhibit certain projective degenerations of smooth $K3$ surfaces of degree $2g-2$ in $\Bbb P^g$ (whose Picard group is generated by the hyperplane class), to a union of two rational normal scrolls, and also to a union of…

alg-geom · Mathematics 2009-10-22 Ciro Ciliberto , Angelo Lopez , Rick Miranda

We study the variety of Poisson structures and compute Poisson cohomology for two families of Fano threefolds - smooth cubic threefolds and the del Pezzo quintic threefold. Along the way we reobtain by a different method earlier results of…

Algebraic Geometry · Mathematics 2013-03-26 Evgeny Mayanskiy

In arXiv:1503.00125, the authors proved that every complete intersection smooth projective variety $Y$ is a Fano visitor, i.e. its derived category $D^b(Y)$ is equivalent to a full triangulated subcategory of the derived category $D^b(X)$…

Algebraic Geometry · Mathematics 2017-02-14 Young-Hoon Kiem , Kyoung-Seog Lee

We show the existence of smooth isolated curves of different degrees and genera in Calabi-Yau threefolds that are complete intersections in homogeneous spaces. Along the way, we classify all degrees and genera of smooth curves on BN general…

Algebraic Geometry · Mathematics 2012-09-06 Andreas Leopold Knutsen

We prove that the stably free modules over a smooth affine threefold over an algebraically closed field of characteristic different from 2 are free.

Commutative Algebra · Mathematics 2019-12-19 Jean Fasel

Given a 3-graph H, let \ex_2(n, H) denote the maximum value of the minimum codegree of a 3-graph on n vertices which does not contain a copy of H. Let F denote the Fano plane, which is the 3-graph \{axx',ayy',azz',xyz',xy'z,x'yz,x'y'z'\}.…

Combinatorics · Mathematics 2013-06-25 Louis DeBiasio , Tao Jiang

The purpose of this note is twofold. First, we give a quick proof of Ballico-Chiantini's theorem stating that a Fano or Calabi-Yau variety of dimension at least 4 in codimension two is a complete intersection. Second, we improve Barth-Van…

Algebraic Geometry · Mathematics 2024-05-21 Jinhyung Park

We propose a new method to study birational maps between Fano varieties based on multiplier ideal sheaves. Using this method, we prove equivariant birational rigidity of four Fano threefolds acted on by the group A6. As an application, we…

Algebraic Geometry · Mathematics 2011-12-08 Ivan Cheltsov , Constantin Shramov

In this article, we introduce a new approach to show the existence and smoothing of simple normal crossing varieties in a given projective space. Our approach relates the above to the existence of nowhere reduced schemes called ribbons and…

Algebraic Geometry · Mathematics 2024-03-08 Purnaprajna Bangere , Francisco Javier Gallego , Jayan Mukherjee

We address the following question: When an affine cone over a smooth Fano threefold admits an effective action of the additive group? In this paper we deal with Fano threefolds of index 1 and Picard number 1. Our approach is based on a…

Algebraic Geometry · Mathematics 2011-06-08 Takashi Kishimoto , Yuri Prokhorov , Mikhail Zaidenberg

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…

Algebraic Geometry · Mathematics 2021-02-22 Ziquan Zhuang

We describe the moduli space of rational curves on smooth Fano varieties of coindex 3. For varieties of dimension 5 or greater, we prove the moduli space has a single irreducible component for each effective numerical class of curves. For…

Algebraic Geometry · Mathematics 2024-09-04 Eric Jovinelly , Fumiya Okamura

Several smooth finite element de Rham complexes are constructed in three-dimensional space, which yield three families of grad-div conforming finite elements. The simplest element has only 8 degrees of freedom (DOFs) for a tetrahedron and…

Numerical Analysis · Mathematics 2020-07-22 Qian Zhang , Zhimin Zhang