Sala Seminari (Dip. Matematica)

Transizione geometrica in dimensione quattro

Tipo Seminario: 
Relatore: 
Stefano Riolo

Negli anni '70, Thurston introduce il concetto di "degenerazione" di strutture iperboliche su 3-varietà. Questo avrà un ruolo nella dimostrazione del celebre "Teorema dell'orbifold".
Nella sua tesi del 2011, Danciger mostra che spesso in presenza di tale degenerazione c'è anche "transizione" a strutture anti de Sitter (AdS). Per "transizione geometrica", si intende un processo continuo che permette di passare da una geometria a un'altra, come ad esempio la familiare transizione iperbolico-euclideo-sferica all'interno della geometria proiettiva.

Data Seminario: 
Wednesday, January 30, 2019
Aula: 
Sala Seminari (Dip. Matematica)
Ora Fine: 
Saturday, January 1, 0000 - 16:00
Affiliazione: 
Neuchatel
Ora Inizio: 
Saturday, January 1, 0000 - 15:00

Generalised solutions via set optimization of Hamilton-Jacobi equation for multi objective cost

Tipo Seminario: 
Relatore: 
Daniela Visetti

Abstract. Vedere file allegato. 

Data Seminario: 
Thursday, January 24, 2019
Aula: 
Sala Seminari (Dip. Matematica)
Ora Fine: 
Saturday, January 1, 0000 - 11:00
Affiliazione: 
Free University of Bozen-Bolzano
Ora Inizio: 
Saturday, January 1, 0000 - 10:00

Periodicity as dimension: NLS ground states on periodic metric graphs

Relatore: 
Simone Dovetta

Abstract
The talk introduces and discusses some recent results on the existence of mass constrained ground states for stationary nonlinear Schrodinger equations on periodic metric graphs.
Even though every metric graph is locally a one–dimensional structure, we will see how different degrees of periodicity give rise to threshold phenomena typical of higher dimensions. In doing so, direct connections between the variational problem under exam and the validity of certain functional inequalities will be pointing out, revealing the relation between periodicity and dimension.

Data Seminario: 
Tuesday, February 5, 2019
Aula: 
Sala Seminari (Dip. Matematica)
Ora Fine: 
Saturday, January 1, 0000 - 13:00
Affiliazione: 
Politecnico di Torino
Ora Inizio: 
Saturday, January 1, 0000 - 12:00

Tensorized Krylov subspace methods: Algorithms, analysis, and applications

Relatore: 
Daniel Kressner

Tensorized Krylov subspace methods are a versatile tool in numerical linear algebra for addressing large-scale applications that involve tensor product structure. This includes the discretization of high-dimensional PDEs, the solution of linear matrix equations, as well as low-rank updates and Frechet derivatives for matrix functions. This talk gives an overview of such methods, discusses their theoretical properties, and highlights applications.

Data Seminario: 
Wednesday, January 9, 2019
Aula: 
Sala Seminari (Dip. Matematica)
Ora Fine: 
Saturday, January 1, 0000 - 12:00
Affiliazione: 
EPFL
Ora Inizio: 
Saturday, January 1, 0000 - 11:00

Quantum invariants of links and manifolds

Relatore: 
Giulio Belletti

Abstract: In 1989 Witten used ideas coming from gauge theory to give
topological invariants of links and 3-manifolds; however his ideas
were not mathematically sound. I will discuss his original approach
and define rigorously the colored Jones function, which is the most
important invariant in Witten's framework.

Prerequisiti: Differential manifolds and forms, basic algebraic topology.

Sito web: http://people.dm.unipi.it/babygeometri/

Data Seminario: 
Thursday, December 20, 2018
Aula: 
Sala Seminari (Dip. Matematica)
Ora Fine: 
Saturday, January 1, 0000 - 18:00
Affiliazione: 
SNS Pisa
Ora Inizio: 
Saturday, January 1, 0000 - 16:30

Le coordinate di Fenchel-Nielsen sullo spazio di Teichmüller

Relatore: 
Agnese Janigro

Abstract: Data una superficie chiusa orientabile di genere g>1 è possibile studiare lo spazio delle metriche riemanniane iperboliche su di essa, ossia quelle con curvatura costante pari a - 1. In questo seminario sarà presentato lo spazio di Teichmüller, che è un quoziente naturale dello spazio delle metriche iperboliche e si descriveranno  le coordinate di Fenchel-Nielsen, le quali forniscono un omeomorfismo fra tale spazio e lo spazio euclideo di dimensione 6g-6.

Data Seminario: 
Thursday, December 13, 2018
Aula: 
Sala Seminari (Dip. Matematica)
Ora Fine: 
Saturday, January 1, 0000 - 18:00
Affiliazione: 
Università di Pavia
Ora Inizio: 
Saturday, January 1, 0000 - 16:30

Computing dependability-oriented measures on Markov chains by means of matrix functions

Relatore: 
Giulio Masetti

In the context of computing and communication system, dependability is defined as the ability to deliver service that can justifiably be trusted.
Dependability is then an umbrella term that encompasses several
attributes, such as: availability, reliability, safety, integrity, maintainability, and confidentiality. Design and analysis of models capable to express functional specifications and behavioural aspects is an important part of the system dependability justification process. 

Data Seminario: 
Thursday, December 13, 2018
Aula: 
Sala Seminari (Dip. Matematica)
Ora Fine: 
Saturday, January 1, 0000 - 11:00
Affiliazione: 
ISTI-CNR
Ora Inizio: 
Saturday, January 1, 0000 - 10:00

The Conway knot is not slice

Relatore: 
Antonio Alfieri

Recently Lisa Piccirillo showed that the Conway knot is not slice. I will
explain this longstanding problem and outline Lisa's proof. I will conclude
with some remarks about Freedman-Gompf-Morrison-Walker's attempt of
disproof of the smooth four-dimensional Poincaré conjecture.

 

Data Seminario: 
Monday, December 3, 2018
Aula: 
Sala Seminari (Dip. Matematica)
Ora Fine: 
Saturday, January 1, 0000 - 18:00
Affiliazione: 
CEU - Budapest
Ora Inizio: 
Saturday, January 1, 0000 - 16:30

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