Wednesday 22 November 2017 h.14:30, Room 2BC30
Alekos Cecchin (Padova, Dip. Mat.)
“Approximation and convergence in finite state Mean Field Games"
Abstract
Mean Field Games represent limit models for symmetric nonzero sum noncooperative dynamic games, when the number N of players tend to infinity. We focus on finite time horizon problems where the position of each agent belongs to a finite state space. Relying on a probabilistic representation of the dynamics in terms of Poisson random measures, we first show that a solution of the Mean Field Game provides an approximate symmetric Nash equilibrium for the Nplayer game. Then, under stronger assumptions for which uniqueness holds, we prove that the sequence on Nash equilibria converges to a Mean Field Game solution. We exploit the socalled Master Equation, which in this framework is a first order quasilinear PDE stated in the symplex of probability measures.
The opening day of the Doctoral School in Mathematics will take place on October 4, 2017, at 15:00 in room 1BC45.
Program
15:00 Room 1BC45: welcome address to the new students
15:10 Presentation of the activities of PhD Programme 2017/18
16:00 Seminario Dottorato  talk of Sebastiano Don: “Fine properties of functions of bounded variation in CarnotCaratheodory spaces”
about 17:00 Refreshments at the meeting room of 7th floor
Per visualizzare la graduatoria inserire la password ricevuta nella mail di conferma di presentazione della domanda per il Corso di Dottorato.
Enter the password you received in the confirmation email when you submitted the application form in order to view the provisional rankings.
Graduatoria Valutazione Titoli
Valutazione Titoli
Wednesday 14 June 2017 h.14:30, Room 2BC30
Anna Tovo (Padova, Dip. Mat.)
“Biodiversity: Mathematical Modelling and Statistics"
Abstract
Ecological systems are characterized by the emergence of universal patterns that are deemed to be insensitive to the details of the system. Such universality motivates the understanding of ecological patterns through mathematical models able to grasp basic mechanisms at work. With this talk, we will try to describe and analyze the elements that underlie these patterns as well as the patterns themselves from a mathematical point of view. In particular we will focus on biodiversity. Identifying and understanding the relationships between all the life on Earth are some of the greatest challenges in science. After a brief introduction aiming to define the basic concepts of biodiversity and its related patterns, we will see different models developed to predict and measure them. We will then tackle the problem of upscaling biodiversity through spatial scales and we will discuss some still open problems that interest the scientific community.
The seminar is intended for a general audience and it will thus be held at an introductory level.
Wednesday 31 May 2017 h.14:30, Room 2BC30
Giacomo Baggio (Padova, DEI)
“The influence of network structure in neuronal information transmission"
Abstract
Understanding how neurons communicate is one of the most challenging open problems in neuroscience. In this talk, I will present some recent results aiming at formulating this problem from a mathematical and informationtheoretic viewpoint. After an overview on neuronal network dynamical models, I will introduce a digital communication framework for studying the information transmission problem in a neuronal network driven by linear dynamics. Within this framework, a novel metric for measuring the information capacity of a neuronal network based on Shannon’s capacity and the notion of intersymbol interference will be discussed. Finally, I will illustrate how the structure of the network matrix and, in particular, its departure from normality, affects the information capacity of a network.
The talk will be introductory in nature and it is intended for a general audience.
Wednesday 3 May 2017 h.14:30, Room 2BC30
Martin Huska (Padova, Dip. Mat.)
“Variational Approaches in Shape Partitioning"
Abstract
The rapid development of 3D scanning technology has incredibly increased the availability of digital models exploited for a wide range of applications varying from computer graphics and medical imaging up to industrial production. One fundamental procedure that processes the raw acquired data for further manipulation, e.g. in product design, animation, deformation and reverse engineering, is the shape partitioning. This process consists in the decomposition of an object into nonoverlapping salient subparts determined by a shape attribute.
In this seminar, we will introduce the concept of Shape Partitioning together with the wide range of partitioning methods. Next, we will observe a few partitioning/segmentation models in the field providing some results. At last, if the time allows, we will introduce the concept of ConvexNonconvex segmentation over surfaces.
The seminar will be held at introductory level, thus, general audience is welcome to participate.
Wednesday 29 March 2017 h.14:30, Room 2BC30
Francesco Ferraresso (Padova, Dip. Mat.)
“An introduction to domain perturbation theory for elliptic eigenvalue problems”
Abstract
How does the sound of a drum depend on its shape? This weak variant of the classical question “Can one hear the shape of a drum?” can be considered in the framework of domain perturbation theory for elliptic differential operators. Starting with easy examples we will see that the answer to this apparently harmless question is rather different in the case of regular perturbations and in the case of singular perturbations. We will focus on the singular case, where the geometry of the problem is deeply mixed with the differential structure, in particular with the boundary conditions. Finally, we will give an account of recent advances in the study of a specific singular perturbation (the dumbbell domain) for the Laplace operator and for the biharmonic operator.
The seminar is intended for a general audience and it aims to introduce basic concepts from spectral theory as well as more advanced research results.
Wednesday 15 March 2017 h.14:30, Room 2BC30
Lucio Fiorin (Padova, Dip. Mat.)
“Quantized option pricing in Mathematical Finance”
Abstract
Quantization is a widely used tool in Signal Processing and Numerical Probability, and it has been recently applied to Mathematical Finance. The quantization of a continuous random variable consists in finding the “best” discrete version of it, i.e. minimizing the L^2 distance. It is possible, using this technique, to create new algorithms for the pricing of European options under different models of the underlying asset.
In this seminar we introduce the basic tools used in mathematical finance and we will present the most common results in the theory of option pricing. After a brief discussion on the existing models of the price of a financial asset, we will give the audience some ideas on how quantization can be a powerful tool able to overcome existing problems.
Wednesday 1 March 2017 h.14:30, Room 2BC30
Christopher Lazda (Padova, INdAM Marie Curie Fellow)
“Topology, analysis and the RiemannHilbert correspondence”
Abstract
The RiemannHilbert correspondence gives a way of passing back and forth between topology and differential geometry, describing the behaviour of differential equations in terms of the monodromy of their local solutions. Starting with the example of the logarithm, I will give an introduction to the ideas behind this correspondence in a concrete and down to earth manner, concentrating on the case of Riemann surfaces. If there is time I will also explain how this gives a completely algebraic way to study topological invariants.
Wednesday 15 February 2017 h.14:30, Room 2BC30
Daniele Tovazzi (Padova, Dip. Mat.)
“Collective periodic behavior in interacting particle systems"
Abstract
Interacting particle systems constitute a wide class of models, originally motivated by Statistical Mechanics, which in the last decades have become more and more popular, extending their applications to various fields of research such as Biology and Social Sciences. These models are important tools that may be used to study macroscopic behaviors observed in complex systems. Among these phenomena, a very interesting one is collective periodic behavior, in which the system exhibits the emergence of macroscopic rhythmic oscillations even though single components have no natural tendency to behave periodically.
This talk aims to introduce to a general audience some basic tools in the theory of interacting particle systems and some of the mechanisms which can enhance the appearance of selfsustained macroscopic rhythm. After recalling some notions of Probability, we present the classical CurieWeiss model, which doesn't exhibit periodic behavior, and we show how we can modify it in order to create macroscopic oscillations. This is also the starting point for some recent developments that will be sketched in the last part of the talk.
