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Nombre de programmes trouvés : 2713
Cours magistraux

le (1h29m42s)

Gilles Courtois - The Margulis lemma, old and new (Part 4)

The Margulis lemma describes the structure of the group generated by small loops in the fundamental group of a Riemannian manifold, thus giving a picture of its local topology. Originally stated for homogeneous spaces by C. Jordan, L. Bieberbach, H. J. Zassenhaus, D. Kazhdan-G. Margulis, it has been extended to the Riemannian setting by G. Margulis for manifolds of non positive curvature. The goal of these lectures is to present the recent work of  V. Kapovitch and B. Wilking who gave a sharp version of the Margulis lemma under the assumption that the Ricci curvature is bounded below. Their method ...
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Conférences

le (1h29m49s)

Et pourtant elle tourne !

Cette conférence est associée à l’installation d’un pendule de Foucault dans l’atrium de la bibliothèque universitaire et à l’exposition qui lui est consacrée sous la responsabilité de Jérôme Brossard, professeur à l’université Le Havre Normandie. Dès l’Antiquité, les astronomes posent la question du mouvement de la Terre et inventent des solutions géométriques compatibles avec son immobilité apparente. La recherche de preuves observables commence avec Copernic. Mais pour parvenir à ses fins, l’astronome doit devenir physicien. Pour détecter la rotation ...
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Cours magistraux

le (1h29m51s)

E. Peyre - Slopes and distribution of points (part1)

The distribution of rational points of bounded height on algebraic varieties is far from uniform. Indeed the points tend to accumulate on thin subsets which are images of non-trivial finite morphisms. The problem is to find a way to characterise these thin subsets. The slopes introduced by Jean-Benoît Bost are a useful tool for this problem. These lectures will present several cases in which this approach is fruitful. We shall also describe the notion of locally accumulating subvarieties which arise when one considers rational points of ...
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Cours magistraux

le (1h29m59s)

P. Salberger - Quantitative aspects of rational points on algebraic varieties (part4)

Let X be a subvariety of Pn defined over a number field and N(B) be the number of rational points of height at most B on X. There are then general conjectures of Manin on the asymptotic behaviour of N(B) when B goes to infinity. These conjectures can be studied using the Hardy-Littlewood method for non-singular complete intersections of high dimensions and by adelic harmonic analysis for varieties related to algebraic groups. But for most varieties there are no other methods available apart from sieve theory ...
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Conférences

le (1h30m3s)

Rahul Pandharipande - Stable quotients and relations in the tautological ring

The topic concerns relations among the kappa classes in the tautological ring of the moduli space of genus g curves. After a discussion of classical constructions in Wick form, we derive an explicit set of relations obtained from the virtual geometry of the moduli space of stable quotients. In a series of steps, the stable quotient relations are transformed to simpler and simpler forms. Our nal result establishes a previously conjectural set of tautological relations proposed a decade ago by Faber{Zagier.
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Cours magistraux

le (1h30m6s)

Yoshihiro Tonegawa - Analysis on the mean curvature flow and the reaction-diffusion approximation (Part 2)

The course covers two separate but closely related topics. The first topic is the mean curvature flow in the framework of GMT due to Brakke. It is a flow of varifold moving by the generalized mean curvature. Starting from a quick review on the necessary tools and facts from GMT and the definition of the Brakke mean curvature flow, I will give an overview on the proof of the local regularity theorem. The second topic is the reaction-diffusion approximation of phase boundaries with key words such as the Modica-Mortola functional and ...
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Conférences

le (1h30m9s)

Usages politiques et sociaux du registre biomédical

Bauer SusanneModeling population health. Reflections on the performativity of epidemiological techniques in the age of genomics Like accounting in the world of business, practices of quantification at the population level are ubiquitous in the health sciences. Risk reasoning has become the common sense mode of knowledge production in the health sciences. Risk assessment techniques of modern epidemiology also co-shape the ways genomic data are translated into population health. The products of these computational practices – risk figures – fold into the very configurations of health matters, co-shaping the body politic in biomedical science, clinical practice and everyday life. In preventive medicine, ...
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Conférences

le (1h30m10s)

Heike Jung, Les formes et modèles du procès pénal - sauvegardes contre la manipulation ?

CHAIRE DE PHYSIOLOGIE DE LA PERCEPTION ET DE L'ACTIONM. Alain BERTHOZ, ProfesseurSéminaire 2007-2008 sous forme de colloque internationalLA PLURALITÉ INTERPRÉTATIVEFONDEMENTS HISTORIQUES ET COGNITIFS DE LA NOTION DE POINT DE VUE.Organisé avec les Professeurs Brian Stock et Carlo Ossola12 et 13 Juin 2008Amphithéâtre Marguerite de Navarre15h30 Heike Jung (Université de la Sarre, Département de Sciences juridiques), Les formes et modèlesdu procès pénal - sauvegardes contre la manipulation ?Voir la liste des vidéos
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