搜索结果: 1-13 共查到“理学 threefolds”相关记录13条 . 查询时间(0.109 秒)
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Density of orbits and arithmetic degrees of automorphisms of projective threefolds
射影三重 轨道密度 自同构 算术度
2023/4/18
The Zariski dense orbit conjecture of the arithmetic dynamic is to study the existence of a rational point P with a Zariski dense orbit of a dominant rational self-map f of a projective variety X. Whe...
A cohomological classification of vector bundles on smooth affine threefolds
cohomological classification vector bundles smooth affine threefolds Algebraic Geometry
2012/4/23
We give a cohomological classification of vector bundles on smooth affine threefolds over algebraically closed fields having characteristic unequal to 2. As a consequence, if A is a smooth affine alge...
On a conjecture of Oguiso about rational curves on Calabi-Yau threefolds
Calabi-Yau threefold, rational curve, nef cone, rational points of cubic forms, Kobayashi's conjecture
2011/9/13
Abstract: Let X be a Calabi-Yau threefold. We show that if there exists on X a non-zero nef non-ample divisor then X contains a rational curve, provided its second Betti number is greater than 4.
Abelianity Conjecture for special threefolds
Abelianity Conjecture special threefolds Algebraic Geometry
2011/8/22
Abstract: Using orbifold metrics of the appropriately signed Ricci curvature on orbifolds with negative or numerically trivial canonical bundle and the two-dimensional Log Minimal Model Program, we pr...
Exceptional collections on toric Fano threefolds and birational geometry
Exceptional collections toric Fano threefolds birational geometry
2011/2/22
Bernardi and Tirabassi show the existence of a full strong excep-tional collection consisting of line bundles on smooth toric Fano 3-folds under assuming Bondal’s conjecture, which states that the Fro...
G-Fano threefolds, I
G-Fano threefolds
2011/2/25
We classify Fano threefolds with only terminal sin-gularities whose canonical class is Cartier and divisible by 2, and satisfying an additional assumption that the G-invariant part of
the Weil diviso...
Heterotic Non-Kahler Geometries via Polystable Bundles on Calabi-Yau Threefolds
Heterotic Non-Kahler Geometries Polystable Bundles Calabi-Yau Threefolds
2010/12/24
In arXiv:1008.1018 it is shown that a given stable vector bundle $V$ on a Calabi-Yau threefold $X$ which satisfies $c_2(X)=c_2(V)$ can be deformed to a solution of the Strominger system and the equat...
Rationality of rationally connected threefolds admitting non-isomorphic endomorphisms
threefolds non-isomorphic endomorphisms
2010/11/12
We prove a structure theorem for non-isomorphic endomorphisms of weak Q-Fano threefolds, or more generally for threefolds with big anti-canonical divisor. Also provided is a criterion for a fibred rat...
Threefolds with quasi-projective universal cover
universal cover L2-theory geometric orbifolds MMP
2010/12/9
We study compact Kähler threefolds X with infinite fundamental group whose universal cover can be compactified. Combining techniques from L2-theory, Campana’s geometric orbifolds and the minimal ...
Towards the Classification of Weak Fano Threefolds with ρ= 2
Towards the Classification Weak Fano Threefolds ρ= 2
2010/12/13
In this paper, we provide examples of Sarkisov links of type II be-tween complex projective Fano threefolds X with (X) = 1. To show examples of these links, we study smooth weak Fano threefolds with ...
On isolated smooth curves of low genera in Calabi-Yau complete intersection threefolds
isolated curves deformations Hilbert schemes Calabi-Yau threefolds
2010/12/10
Building on results of Clemens and Kley, we find criteria for a continuous family of curves in a nodal K-trivial threefold Y0 to deform to a scheme of finitely many smooth isolated curves in a general...
In 1977, S.-T. Yau [21] proved the famous Calabi conjecture; as a consequence we know that every compact K¨ahler manifold with vanishing first Chern class admits a Ricci-flat K¨ahler metric. This spec...
Calabi-Yau Threefolds and Moduli of Abelian Surfaces I
Calabi-Yau Threefolds Moduli of Abelian Surfaces I
2010/10/29
We describe birational models and decide the rationality/unirationality of moduli spaces AA_{d} (and AA^{lev}_{d}) of (1,d)-polarized abelian surfaces (with canonical level structure, respectively) f...