Notiziario Scientifico
Settimana dal 29 settembre al 5 ottobre 2014
Lunedì 29 settembre 2014
Lunedì 29 settembre 2014
Martedì 30 settembre 2014
Mercoledì 1 ottobre 2014
Mercoledì 1 ottobre 2014
Mercoledì 1 ottobre 2014
Giovedì 2 ottobre 2014
Giovedì 2 ottobre 2014
Giovedì 2 ottobre 2014
Giovedì 2 ottobre 2014
Venerdì 3 ottobre 2014
Tutte le informazioni relative a questo notiziario devono pervenire
all'indirizzo di posta elettronica
seminari@mat.uniroma1.it
entro le ore 9 del venerdì precedente la settimana di pubblicazione.
Ore 11:00, Aula 211, Università di Roma III
Seminario di Geometria
Instantons on Riemannian 4-folds. Atiyah-Ward correspondence. Hermitian-Yang-Mills bundles on Kahler
surfaces and the Hitchin-Kobayashi correspondence. Donaldson's correspondence between instantons and
framed bundles. Degenerations. Framed sheaves on the projective plane.
Ore 18:00, Aula 1B1, Dipartimento SBAI
Ore 15:00, Aula C, Dipartimento di Fisica, via della Vasca Navale 84
Colloqui di Fisica
Earth's climate is a complex and complicated dynamical system. Complicated, because it is composed
of many interacting elements (ocean, atmosphere, cryosphere, biosphere, and so on). Complex, because
these elements interact with each other in strongly nonlinear ways and on a large range of space and
time scales, producing feedbacks, multiple equilibria and instabilities. In this talk, I shall
discuss some of the nonlinear feedbacks active in the climate system, focusing on the rich spectrum
of interactions between climate, Earth surface and biosphere and then moving to the broad theme of
cross-scale interactions, including the role of atmospheric convection. The talk will be concluded
by some general considerations on climate predictability and on the need for estimating and
mitigating natural hazards in globally changing climate conditions.
Ore 9:15, Aula di Consiglio
9:15-9:30 Laudatio for Tullio Levi Civita Prize 2014 to Errico Presutti
9:30-10:20 Errico Presutti "Stationary states of large systems: the microscopic, mesoscopic and
macroscopic theories"
10:20-10:30 Questions and Discussion
10:30-10:45 Coffee break
10:45-11:35 Sergio Simonella "Analysis of the error in the Boltzmann-Grad limit"
11:35-11:45 Questions and Discussion
11:45-12:35 Robert Martin "Geodesics on GL(3) and nonlinear elasticity"
12:35-12:45 Questions and Discussion
Ore 11:00, Aula 211, Università di Roma III
Seminario di Geometria
Huybrechts-Lehn's theory of framed modules. Framed sheaves on projecive surface. Localization. Toric
actions. Poincaré polynomials of moduli spaces of framed sheaves. Nekrasov parition
functions.
Ore 14:30, Aula di Consiglio
Seminario di Algebra e Geometria
Ad ogni cluster algebra, grazie al fenomeno di Laurent, si puo' associare in maniera naturale una
famiglia di vettori a coordinate intere (i vettori d delle variabili cluster). Sorprendentemente
questa famiglia codifica molte delle proprieta' combinatoriche dell'algebra di partenza. In questo
seminario, dopo aver ricordato le definizioni di base, spieghero' come costruire l'insieme dei
vettori d nel caso di algebre cluster di tipo finito ed affine, utilizzando l'azione di una
particolare simmetria del corrispondente sistema di radici.
Ore 14:00, Aula di Consiglio
Seminario P(n): Problemi differenziali non lineari
Ore 14:30, Aula 211, Università di Roma III
Seminario di Geometria
A generalization of Berkovich's skeletons will be introduced which is suitable for comparing with
tropicalizations. In fact, we will see that such a skeleton can be faithfully embedded into a
suitable tropicalization. In this way, we can compare arithmetic and geometric information of the
underlying algebraic variety. A rational function induces a piecewise linear function on the
skeleton which satises a slope formula. The latter is a non-archimedean analogue of the
Poincaré-Lelong formula in complex analysis. This is joint work with Joseph Rabinoff and
Annette Werner.
Ore 16:00, Aula 211, Università di Roma III
Seminario di Geometria
We use stacky compactifications of minimal resolutions of singularities of type A_k (ALE spaces) and
a theory of framed sheaves on projective stacks to give rigorous definitions of partition functions
for supersymmetric gauge theories on ALE spaces. We show that in dimension 2 the moduli functor for
framed sheaves on projective stacks is representable, and is represent by a scheme, for which it is
possible to compute the obstruction to smoothness. For the case of the stacky compactifications of
A_k ALE spaces, that scheme contains a dense open subvariety which is a moduli spaces for instantons
on the ALE spaces with fixed Chern classes and holonomy at infinity
Ore 17:00, Aula di Consiglio
Ore 11:00, Aula 34 (quarto piano), Dipartimento di Scienze Statistiche
The traditional versions of jump-telegraph market models are based on a Poisson process with
deterministic alternating jump intensities. An alternating doubly stochastic Poisson process with
random intensities of jumps is proposed as a new base. More precisely, I assume the switching
intensities of the Poisson process to follow a telegraph process. The new telegraph process with
underlying doubly stochastic Poisson process is studied. This corresponds to model which is subject
to external influences changing the internal market situation. Martingale measures for this type of
processes are completely described by using Girsanov's transformation.
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