Le 02 novembre |
-Junjiro Noguchi (Tokyo)
-A new fundamental theorem for
entire curves into semi-abelian varieties and applications..
-We will recall a new second
fundamental theorem recently obtained for entire curves into a
semiabelian variety by a truncated counting function of level one,which
is the best possible estimate (Nog.-Winkelmann-Yamanoi 02/08). We will
discuss its implications and the applications for the algebraic
degeneracy problem for entire curves and a new unicity theorem extending
Yamanoi’s unicity theorem..
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Le 09 novembre
à 13:30
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-Siye Wu
(Hong-Kong)
-Projective flatness
in the geometric quantisation of bosons and fermions.
-Geometric quantization requires choosing a
real or complex polarisation. Quantum physics is independent of the
choice if there exists a projectively flat connection on the vector
bundle of Hilbert spaces over the space of polarizations. In this talk,
I begin with symplectic vector spaces and explain the geometry of
projectively flat vector bundles over Siegel’s bounded domain.
Quantization of fermionic systems will be studied and is related to
Clifford algebra and spinors.
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Le 16 novembre |
-Bo Berndtsson
(Göteborg )
-Probability
measures associated to geodesics in the space of Kähler metrics.
-In the theory of extremal Kähler
metrics the notion of geodesics in the space of Kähler metrics plays an
important role.We show how to associate to each such geodesic a
probability measure on R . This measure encodes several properties of
the geodesic: Its expectation equals the relative Aubin-Yau energy of
the endpoints nd its variance is the geodesic distance between the
endpoints. We show that the measure can be obtained from the eigenvalue
distribution of certain Toeplitz operators coming from ’finite
dimensional geodesics’. This implies in particular a theorem of Chen and
Sun, saying that geodesic distance is the limit of geodesic distance in
certain finite dimensional approximations of the space.
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Le 23 novembre |
-Oscar García-Prada
(Madrid)
-A Milnor-Wood
inequality for complex hyperbolic lattices in quaternionic space.
-We prove a Milnor-Wood inequality
for representations of the fundamental group of a compact complex
hyperbolic manifold in the group of isometries of quaternionic
hyperbolic space. Of special interest is the case of equality, and its
application to rigidity.We show that equality can only be achieved for
totally geodesic representations, thereby establishing a global rigidity
theorem for totally geodesic representations. Joint work with Domingo
Toledo.
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Le 30 novembre
|
-Simon Salamon
(Turin)
-Calabi-Yau
equations on 4-manifolds.
-We extend an example of Tosatti-Weinkove to the problem of
seeking a symplectic form with assigned volume on an almost complex
nilmanifold of dimension 4. In an invariant setting, the problem reduces
to a 2-torus where one can solve an associated Monge-Ampere type
equation. (Joint work with A. Fino, Y. Li, L.Vezzoni.).
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Le 07 décembre
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-Abdelghani Zeghib
(Lyon)
-Variétés
kählériennes à gros groupe d'automorphismes.
-Résumé. Le groupe des difféomorphismes holomorphes d’un tore complexe
de dimension n, est composé des translations, ainsi qu’un sous-groupe
discret G contenu SLn(C). Génériquement G est trivial, et dans les cas
les plus symétriques, il peut être un réseau de SLn(C), ou SLn(R), e.g.
G=SLn(Z). Nous classons les variétés kählériennes compactes de dimension
n admettant une action holomorphe d’un groupe G isomorphe à un réseau de
SLn(R) ou SLn(C), ou plus généralement un réseau d’un groupe de Lie
simple de rang (réel) n-1. Elles dérivent de tores, par une construction
à la Kummer. Il s’agit d’un travail en collaboration avec S. Cantat.
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Le 14 décembre
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-Andrea Ianuzzi
(Rome)
-A classification of
taut, Stein surfaces with a proper action of (R,+).
-Let X be a 2 dimensional taut, Stein manifold with a proper
action of (R,+) by biholomorphisms. In order to give a
classification up to R-equivariant biholomorphisms, we first
determine the globalization X* with respect to the induced local C-action,
showing that it is Stein. For this an important ingredient is a recent
result of C. Miebach and K. Oeljeklaus which implies that the
C-action on X* is also proper. Then, one needs to understand all
possible R-invariant, taut, Stein submanifolds of X*. Joint work with
Stefano Trapani.
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