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Search Results: 1 - 10 of 11270 matches for " Carolina Araujo "
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The cone of pseudo-effective divisors of log varieties after Batyrev
Carolina Araujo
Mathematics , 2005, DOI: 10.1007/s00209-008-0457-8
Abstract: In these notes we investigate the cone of nef curves of projective varieties, which is the dual cone to the cone of pseudo-effective divisors. We prove a structure theorem for the cone of nef curves of projective $\mathbb Q$-factorial klt pairs of arbitrary dimension from the point of view of the Minimal Model Program. This is a generalization of Batyrev's structure theorem for the cone of nef curves of projective terminal threefolds.
Identifying quadric bundle structures on complex projective varieties
Carolina Araujo
Mathematics , 2008,
Abstract: In this paper we characterize smooth complex projective varieties that admit a quadric bundle structure on some dense open subset in terms of the geometry of certain families of rational curves.
K?hler-Einstein Metrics for some quasi smooth log del Pezzo Surfaces
Carolina Araujo
Mathematics , 2001,
Abstract: Recently Johnson and Koll\'ar determined the complete list of anticanonically embedded quasi smooth log del Pezzo surfaces in weighted projective 3-spaces. They also proved that many of those surfaces admit a K\"ahler-Einstein metric, and that some of them do not have tigers. The aim of this paper is to settle the question of the existence of K\"ahler-Einstein metrics and tigers for those surfaces for which the question was still open. In order to do so, we will use techniques developed earlier by Nadel and Demailly and Koll\'ar.
Rationally connected varieties
Carolina Araujo
Mathematics , 2005,
Abstract: This is an expository paper on rationally connected varieties. The aim is to provide an introduction to the subject, as well as to discuss a recent result by T. Graber, J. Harris and J. Starr. The paper is based on the talk I gave at the 2004 Summer Research Conference on Algebraic Geometry at Snowbird.
Rational curves of minimal degree and characterizations of ${\mathbb P}^n$
Carolina Araujo
Mathematics , 2004,
Abstract: In this paper we investigate complex uniruled varieties $X$ whose rational curves of minimal degree satisfy a special property. Namely, we assume that the tangent directions to such curves at a general point $x\in X$ form a linear subspace of $T_xX$. As an application of our main result, we give a unified geometric proof of Mori's, Wahl's, Campana-Peternell's and Andreatta-Wi\'sniewski's characterizations of ${\mathbb P}^n$.
Explicit log Fano structures on blow-ups of projective spaces
Carolina Araujo,Alex Massarenti
Mathematics , 2015,
Abstract: In this paper we determine which blow-ups $X$ of $\mathbb{P}^n$ at general points are log Fano, that is, when there exists an effective $\mathbb{Q}$-divisor $\Delta$ such that $-(K_X+\Delta)$ is ample and the pair $(X,\Delta)$ is klt. For these blow-ups, we produce explicit boundary divisors $\Delta$ making $X$ log Fano.
On codimension 1 del Pezzo foliations on varieties with mild singularities
Carolina Araujo,Stéphane Druel
Mathematics , 2012,
Abstract: In this paper we extend to the singular setting the theory of Fano foliations developed in our previous paper. A Q-Fano foliation on a complex projective variety X is a foliation F whose anti-canonical class is an ample Q-Cartier divisor. In the spirit of Kobayashi-Ochiai Theorem, we prove that under some conditions the index i of a Q-Fano foliation is bounded by the rank r of F, and classify the cases in which i=r. Next we consider Q-Fano foliations F for which i=r-1. These are called del Pezzo foliations. We classify codimension 1 del Pezzo foliations on mildly singular varieties.
On smooth lattice polytopes with small degree
Carolina Araujo,Douglas Mons?res
Mathematics , 2013,
Abstract: Toric geometry provides a bridge between the theory of polytopes and algebraic geometry: one can associate to each lattice polytope a polarized toric variety. In this paper we explore this correspondence to classify smooth lattice polytopes having small degree, extending a classification provided by Dickenstein, Di Rocco and Piene. Our approach consists in interpreting the degree of a polytope as a geometric invariant of the corresponding polarized variety, and then applying techniques from Adjunction Theory and Mori Theory.
Codimension 1 Mukai foliations on complex projective manifolds
Carolina Araujo,Stéphane Druel
Mathematics , 2014,
Abstract: In this paper we classify codimension 1 Mukai foliations on complex projective manifolds
On Fano foliations 2
Carolina Araujo,Stéphane Druel
Mathematics , 2014,
Abstract: In this paper we study mildly singular del Pezzo foliations on complex projective manifolds with Picard number one
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