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Nombre de programmes trouvés : 3262
Conférences

le (1h6s)

La Sicile au-delà des mythes

Depuis toujours, la Sicile a suscité des fantasmes positifs et négatifs. Elle nous fait rêver par sa capacité à assimiler harmonieusement des héritages aussi différents que ceux grecs, romains, arabo-berbères, normands, espagnols ; elle nous inquiète comme terre de la mafia et plus généralement, par sa profonde originalité. Nous nous proposons de présenter l’histoire de cette grande île au coeur de la Méditerranée depuis Homère jusqu’à la crise des migrants, en la dépouillant des filtres qui en brouillent et en déforment la perception.
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Conférences

le (1h5s)

Greg McShane - Volumes of hyperbolics manifolds and translation distances

Schlenker and Krasnov have established a remarkable Schlaffli-type formula for the (renormalized) volume of a quasi-Fuchsian manifold. Using this, some classical results in complex analysis and Gromov-Hausdorff  convergence for sequences of open 3-manifolds due to Brock-Bromberg one obtains explicit upper bounds for the volume of a mapping torus in terms of the translation distance of the monodromy on Teichmueller space. We will explain Brock-Bromberg's approach to the Thurston's uniformization theorem for hyperbolic manifolds which are mapping tori. In particular the "coarse geometry" of the convex core of a quasi fuchsian manifold.
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Conférences

le (1h3s)

T. Darvas - Complex Monge-Ampère equations with prescribed singularity type

Given a Kahler manifold (X, ω), finding smooth solutions to the equation (ø +i∂̄∂u)n=føn goes back to Yau’s solution of the Calabi conjecture in the seventies. In joint work with E. Di Nezza and C.H. Lu, we proposed to solve this same equation with the added constraint that u ∈ PSH(X, ω) has prescribed singularity type. As it turns out, this problem is well posed only ...
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Conférences

le (59m58s)

Lars Andersson - Symmetry operators and energies

Black holes play a central role in general relativity and astrophysics. The problem of proving the dynamical stability of the Kerr black hole spacetime, which is describes a rotating black hole in vacuum, is one of the most important open problems in general relativity.Following a brief introduction to the evolution problem for theEinstein equations, I will give some background on geometry of the Kerr spacetime. Theanalysis of fields on the exterior of the Kerr black hole serve as important model problems for the black hole stability problem. I will discuss some of the difficulties one encounters in analyzing waves in ...
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Conférences

le (59m57s)

G. Binyamini - Point counting for foliations over number fields

We consider an algebraic $V$ variety and its foliation, both defined over a number field. Given a (compact piece of a) leaf $L$ of the foliation, and a subvariety $W$ of complementary codimension, we give an upper bound for the number of intersections between $L$ and $W$. The bound depends polynomially on the degree of $W$, the logarithmic height of $W$, and the logarithmic distance between $L$ and the locus of points where leafs of the foliation intersect $W$ improperly.  Using this theory ...
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