Academic literature on the topic 'Positivité de fibrés en droites'
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Journal articles on the topic "Positivité de fibrés en droites":
Broustet, Amaël. "Non-annulation effective et positivité locale des fibrés en droites amples adjoints." Mathematische Annalen 343, no. 4 (October 16, 2008): 727–55. http://dx.doi.org/10.1007/s00208-008-0272-x.
Mourougane, Christophe. "Images directes de fibrés en droites adjoints." Publications of the Research Institute for Mathematical Sciences 33, no. 6 (1997): 893–916. http://dx.doi.org/10.2977/prims/1195144881.
Vallès, Jean. "Fibrés de Schwarzenberger et coniques de droites sauteuses." Bulletin de la Société mathématique de France 128, no. 3 (2000): 433–49. http://dx.doi.org/10.24033/bsmf.2376.
Maillot, Vincent. "Géométrie d'Arakelov des variétés toriques et fibrés en droites intégrables." Mémoires de la Société mathématique de France 1 (2000): 1–129. http://dx.doi.org/10.24033/msmf.393.
Hajli, Mounir. "La torsion analytique holomorphe généralisée des fibrés en droites intégrables." Comptes Rendus Mathematique 352, no. 5 (May 2014): 441–45. http://dx.doi.org/10.1016/j.crma.2014.03.010.
Mihai, Paun. "Sur l'effectivité numérique des images inverses de fibrés en droites." Mathematische Annalen 310, no. 3 (March 1, 1998): 411–21. http://dx.doi.org/10.1007/s002080050154.
TCHOUDJEM, A. "Cohomologie des fibrés en droites sur les compactifications des groupes réductifs." Annales Scientifiques de l’École Normale Supérieure 37, no. 3 (May 2004): 415–48. http://dx.doi.org/10.1016/j.ansens.2003.11.001.
Tchoudjem, Alexis. "Cohomologie des fibrés en droites sur les variétés magnifiques de rang minimal." Bulletin de la Société mathématique de France 135, no. 2 (2007): 171–214. http://dx.doi.org/10.24033/bsmf.2531.
Tchoudjem, Alexis. "Cohomologie des fibrés en droites sur la compactification magnifique d'un groupe semi-simple adjoint." Comptes Rendus Mathematique 334, no. 6 (January 2002): 441–44. http://dx.doi.org/10.1016/s1631-073x(02)02288-4.
Tchoudjem, Alexis. "Sur la cohomologie à support des fibrés en droites sur les variétés symétriques complètes." Transformation Groups 15, no. 3 (July 23, 2010): 655–700. http://dx.doi.org/10.1007/s00031-010-9105-6.
Dissertations / Theses on the topic "Positivité de fibrés en droites":
Broustet, Amaël. "Positivité locale des fibrés en droites amples adjoints." Université Joseph Fourier (Grenoble), 2007. http://www.theses.fr/2007GRE10119.
This thesis is about local positivity ofample line bundles, mesured by the Seshadri constants ofthis line bundle. It is conjectured by Ein 1 and Lazarsfeld that Seshadri constants of a big and nef line bundle are bounded by below by 1 for each point in very general position. We show this conjecture:. For each ample line bundle on a smooth variety X of dimension 3 with -K_X nef,. For each big and nef adjoint line bundle on a variety X with canonical singularities of dimension 3 with K_X nef,. For each ample adjoint line bundle of « big volume» on a smooth variety X of dimension 3,. For each ample line bundle on a factorial almost Fano variety X, with terminal singularities, and of co-indice at most 3,. For each ample line bundle O(D) on a smooth Fano variety X of dimension 4 such that K_X - rD. The proof of this results use the existence of non-zero global sections for sorne line bundles. There is a conjecture of Kawamata about this and we prove it in dimension 3 for line bundles of « big volume ». The last chapter is about the uniruledness of the base loci of big and non-nef adjoint line bundles. Big and non-nef line bundles appear in a natural way when an ampleline bundle has a « small » Seshadri constant in a point
Denisi, Francesco Antonio. "Positivité sur les variétés irréductibles holomorphes symplectiques." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0162.
In this thesis, we study some aspects of the positivity of divisors on irreducible holomorphic symplectic (IHS) manifolds. Fix a projective IHS manifold X of complex dimension 2n. Inspired by the work of Bauer, Küronya, and Szemberg, we show that the big cone of X has a locally finite decomposition into locally rational polyhedral subcones, called Boucksom-Zariski chambers. These subcones have a geometric meaning: on any of them, the volume function is expressed by a homogeneous polynomial of degree 2n. Furthermore, in the interior of any Boucksom-Zariski chamber, the divisorial part of the augmented base locus of big divisors stays the same. After analyzing the big cone, we determine the structure of the pseudo-effective cone of X, generalizing a well-known result due to Kovács for K3 surfaces. In particular, we show that if the Picard number of X is at least 3, the pseudo-effective cone either is circular or does not contain circular parts and is equal to the closure of the cone generated by the prime exceptional divisor classes. From this result in convex geometry, we deduce some geometric properties of X and show the existence of rigid uniruled divisors on some singular symplectic varieties. We study the behaviour of the asymptotic base loci of big divisors on X, and we provide a numerical characterization for them. As a consequence of this numerical characterization, we obtain a description for the dual of the cones mathrm{Amp}_k(X), for any 1leq k leq 2n, where mathrm{Amp}_k(X) is the convex cone of big divisor classes having the augmented base locus of dimension strictly smaller than k. Using the divisorial Zariski decomposition, the Beauville-Bogomolov-Fujiki (BBF) form, and the decomposition of the big cone of X into Boucksom-Zariski chambers, we associate to any big divisor class alpha and a prime divisor E on X a polygon Delta_E(alpha) whose geometry is related to the variation of the divisorial Zariski decomposition of alpha in the big cone. Its euclidean volume is expressed in terms of the BBF form and is independent of the choice of E. We show that these polygons fit in a convex cone Delta_E(X) as slices, globalizing in this way the construction. To conclude, we show that under some hypothesis, the polygons Delta_E(alpha) can be expressed as a Minkowski sum of some polygons {Delta_E(Beta_i)}_{i in I}, for some big classes {Beta_i}_{_ iin I}. Remarkably, these polygons behave like the Newton-Okounkov bodies of big divisors on smooth projective surfaces
Claudon, Benoît. "Déformation de variétés kählériennes compactes : invariance de la $\Gamma$-dimension et extension de sections pluricanoniques." Phd thesis, Université Henri Poincaré - Nancy I, 2007. http://tel.archives-ouvertes.fr/tel-00199485.
Vallès, Jean. "Diviseurs inattendus de droites sauteuses : Fibrés de schwarzenberger." Paris 6, 1996. http://www.theses.fr/1996PA066420.
Plechinger, Valentin. "Espaces de modules de fibrés en droites affines." Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0367.
The study of fibre bundles is an important subject in complex geometry. This thesis considers the particular case of affine line bundles over complex spaces. Affine line bundles are a natural generalisation of line bundles. The first part of this thesis studies the classical moduli problem and the existence of fine moduli spaces. In analogy to the study of line bundles, an affine Picard functor is defined. It is shown that this moduli space will (unless trivial) not be Hausdorff which leads to the study of framed affine line bundles. An exact criterion for the existence of a moduli space for this problem is given. Since the existence of such moduli spaces is very rare, the modern approach of stacks is used in the second part. To give a simpler description of this stack, the theory of fibrewise split extensions is developed. This theory is very general and is of independent interest. For a complex projective variety X, this approach allows to identify the stack of affine line bundles with a quotient stack of linear fibre spaces over the Picard scheme Pic(X). As an application, the homotopy type of this stack is calculated
Dubouloz, Adrien. "Sur une classe de schémas avec actions de fibrés en droites." Université Joseph Fourier (Grenoble), 2004. https://tel.archives-ouvertes.fr/tel-00007733.
On a affine algebraic variety S defined over a field k of characteristic zer o, there exists a well-known correspondence between algebraic actions of the add itive group k+=(k,+) and locally nilpotent derivations of the algebra of regular functions on S. Here we extend this equivalence between actions and derivations to the following relative situation : p:S ? X is a scheme over a fixed base scheme X, which comes equipped with an algebraic action of a l ine bundle p:L?X over X. We study a special sub-class of schemes S as above, with the additional property that p:S ? X factors through the structural morphism p':S?Y of a principal homogeneous bundle under a line bundle p':L'?Y over an X-scheme d:Y?X, in such a way that the action of d*L on S factors through the one of L'. We call them Danielewski-Fieseler schemes. We give different procedures to construct these schemes. In particular, in case that the base scheme X is affine, we give an algorithm which produces explicit embeddings of these schemes in relatives affine spaces over X. Then we study the case that the base scheme X is isomorphic to the affine line over a field k of characteristic zero. In this case, we establish that a Danielewski-Fieseler scheme is uniquely determined by a combinatorial data consisting of a weighted rooted tree. We classify these schemes through their associated trees. Finally, we give a combinatorial characterization of those schemes which admit many actions of the additive group k+ with distinct gener al orbits
Mourougane, Christophe. "Notions de positivité et d'amplitude des fibrés vectoriels : théorèmes d'annulation sur les variétés kahlériennes." Université Joseph Fourier (Grenoble ; 1971-2015), 1997. http://www.theses.fr/1997GRE10028.
Păun, Mihai. "Fibrés en droites numériquement effectifs et variétés kahlériennes compactes à courbure de Ricci nef." Université Joseph Fourier (Grenoble ; 1971-2015), 1998. http://www.theses.fr/1998GRE10011.
Liu, Linyuan. "Cohomologie des fibrés en droites sur SL3/B en caractéristique positive : deux filtrations et conséquences." Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS229.
Let G be a semi-simple algebraic group over an algebraically closed field of positive characteristic. The cohomology of G-equivariant line bundles over G/B induced by a character of B are important objects in the representation theory of G. In this thesis, we concentrate on G = SL3. In the first chapter,we prove the existence of a two-step filtration of H1(μ) and H2(μ) when μ is in the closure of the Griffith region. In the second chapter, we prove the existence ofa p-Hi-D-filtration of Hi(μ) for all i and μ, which generalizes the p-filtration ofH0(μ) introduced by Jantzen. In the third chapter, we study and determine the structure of the modules appearing in the p-Hi-D-filtration. In the last chapter,we give an explicit and combinatorial description of H2(μ) for μ in the Griffith region and we generalize this description to Hd(G/B, μ) for G = SLd+1 and certain weights μ
Vallès, Jean. "Quelques contributions à la classification des fibrés vectoriels sur les espaces projectifs complexes." Habilitation à diriger des recherches, Université de Pau et des Pays de l'Adour, 2010. http://tel.archives-ouvertes.fr/tel-00512155.
Books on the topic "Positivité de fibrés en droites":
Maillot, Vincent. Géométrie d'Arakelov des variétés toriques et fibrés en droites intégrables. [Paris, France]: Société mathématique de France, 2000.
Book chapters on the topic "Positivité de fibrés en droites":
Beauville, Arnaud. "Annulation du H1 pour les fibrés en droites plats." In Lecture Notes in Mathematics, 1–15. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/bfb0094507.