Geometria_Pisa March 2017

geometria_pisa@lists.dm.unipi.it

3 participants
7 discussions

Seminario domani
by Bruno Martelli 28 Mar '17

28 Mar '17

Buondì, vi annuncio il seminario di geometria di domani, sempre alle 15 in aula seminari. Siete tutti invitati. a presto, Bruno ------ 29-Mar-2017 - 15:00 Sala Seminari (Dip. Matematica) <http://www.dm.unipi.it/webnew/it/aula/sala-seminari-dip-matematica> New perspectives on lattice gauge field theories <http://www.dm.unipi.it/webnew/it/seminari/new-perspectives-lattice-gauge-fi…> Stéphane Baseilhac

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Seminari dei Baby-Geometri
by Nicoletta Tardini 28 Mar '17

28 Mar '17

Cari tutti, Venerdì 31 Marzo alle 14:30 presso l'Aula Seminari del dipartimento di matematica di Pisa si terrà il Seminario dei Baby-Geometri di Roberta Maccheroni (Università di Parma) dal titolo: "Topological and holomorphic disk filling" di cui riporto l'abstract: "In this talk Ill describe the problem of filling submanifolds with topological or holomorphic disks. The case of geodesics on compact Riemannian surfaces with nonpositive scalar curvature will be treated. I will prove non existence of such disk filling, using several different tecniques. Two possible generalizations in higher dimension will be shown: the product of geodesics on the product of compact Riemannian surfaces with nonpositive scalar curvature does not admit a holomorphic disk filling; a minimal Lagrangian torus in a Kahler 4-manifold with nonpositive Ricci tensor does not admit an holomorphic filling with a solid torus." Tutti gli interessati sono invitati a partecipare. Per saperne di più sui prossimi seminari scrivete ad uno degli organizzatori o consultate le pagine: http://blog.phc.unipi.it/babygeometri/ http://gecogedi.dimai.unifi.it/seminars/ Mailing-list: babygeom(a)poisson.phc.unipi.it Saluti, Carlo Collari, Marco Moraschini e Nicoletta Tardini

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Mini-workshop “Filling by holomorphic discs”, Pisa
by Daniele Angella 22 Mar '17

22 Mar '17

-------------------------------------------------------- Mini-workshop “Filling by holomorphic discs”, Pisa Nei giorni 3-5 aprile, Kai Zehmisch (Universitaet Muenster) terra' un ciclo di 4 seminari presso La Scuola Normale Superiore, Pisa, sul tema “Filling by holomorphic discs”, con particolare riguardo alle sue applicazioni al Teorema di Cerf riguardante i diffeomorfismi di S^3. Non sono previsti particolari pre-requisiti. Orario delle lezioni: Lunedi' 3 aprile: 14-16 Martedi' 4 aprile: 9-11, 18-20 Mercoledi' 5 aprile: 11-13 La prima lezione avra' luogo nell'aula del Collegio Puteano/Centro de Giorgi, in Piazza dei Cavalieri. Per ulteriori informazioni si prega di contattare Tommaso Pacini, tommaso.pacini(a)unito.it

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Seminario domani
by Bruno Martelli 21 Mar '17

21 Mar '17

buondì, con colpevole ritardo vi segnalo il seminario di geometria di domani. Siete tutti invitati. a presto, Bruno ----- 22-Mar-2017 - 15:00 Sala Seminari (Dip. Matematica) <http://www.dm.unipi.it/webnew/it/aula/sala-seminari-dip-matematica> Entropy and length rigidity of negatively curved manifolds of finite volume <http://www.dm.unipi.it/webnew/it/seminari/entropy-and-length-rigidity-negat…> Andrea Sambusetti The problems of conjugacy rigidity and of entropy rigidity have a long history, with major breakthroughs in the last twenty years, for negatively curved compact manifolds and symmetric spaces. On the other hand, little is known for finite volume manifolds. I will survey the state of the art of these problems, and explain what can be generalized to finite volume manifolds, pointing out the main difficulties that arise in the non-compact case.

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SMI course "Kaehler-Einstein metrics"
by Nicoletta Tardini 15 Mar '17

15 Mar '17

https://gecogedi.dimai.unifi.it/event/404/ Date: Sunday, April 30, 2017 -- Saturday, May 06, 2017 Place: Palazzone della Scuola Normale Superiore, Cortona (AR), Italy ######################## FIRST ANNOUNCEMENT ###################### SMI course "Kaehler-Einstein metrics" Aim of the course is to present classical and recent results on Kaehler-Einstein metrics on compact complex manifolds, focusing on existence (e.g., Yaus proof of the Calabis conjecture, alpha invariant criterion), obstructions, relations to algebraic geometric notions of stability (e.g. K-stability) and examples (e.g., KE metrics on Toric Fano manifolds). Main speaker: - Cristiano Spotti The list of invited speakers includes: - Gao Chen (Stony Brook, IAS) - Paul Gauduchon (Paris) - Long Li (Grenoble) - Alexandra Otiman (Bucharest) - Chengjian Yao (Bruxelles) - Kai Zheng (Warwick) For further informations and for the registration, please visit the webpage: https://gecogedi.dimai.unifi.it/event/404/ The event is supported by: Scuola Matematica Interuniversitaria; Dipartimento di Matematica e Informatica "Ulisse Dini", Firenze; SIR2014 AnHyC "Analytic aspects in complex and hypercomplex geometry" (code RBSI14DYEB); GNSAGA-INdAM. Please, feel free to contact the organizers: - Daniele Angella (daniele.angella(a)unifi.it) - Simone Calamai (scalamai(a)math.unifi.it) - Graziano Gentili (graziano.gentili(a)math.unifi.it) - Cristiano Spotti (c.spotti(a)dpmms.cam.ac.uk) - Nicoletta Tardini (tardini(a)mail.dm.unipi.it) #########################################################################

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Seminari dei Baby-Geometri
by Nicoletta Tardini 13 Mar '17

13 Mar '17

Cari tutti, Giovedì 16 Marzo alle 18:30 presso l'Aula Seminari del dipartimento di matematica di Pisa si terrà il Seminario dei Baby-Geometri di Riccardo Pedrotti (Università di Bonn) dal titolo: "Stable classification of four Manifolds" di cui riporto l'abstract: "The classification of smooth four manifolds up to diffeomorphism is one of nightmares of a Topologist: its known to be impossible (it would solve the Word Problem) in full generality, but for certain classes of fundamental groups there are important results mainly due to Freedman. If we allow more relaxed notions of classification then much more can be said and computed. This talk is intended as an introduction to the concept of stable classification of four manifolds, which studies four manifolds up to connected sum of copies of S2 x S2. The main results are due to M. Kreck and P. Teichner. I will focus on Teichners approach via spectral sequences since it requires a limited background and provides quick but interesting results. My intention is to focus on the relevant definitions and constructions necessary to understand whats going on and what one should know in order to start computing the stable classification for a fixed fundamental group. In the end I want to discuss some interesting byproducts of such classification, which are related to the divisibility of the signature of an (almost-spin) four manifold. Some non-trivial key-words are: almost-spin manifolds, B-bordism, James spectral sequence, Atyiah-Hirzebruch spectral sequence, \pi1-fundamental class" Tutti gli interessati sono invitati a partecipare. Per saperne di più sui prossimi seminari scrivete ad uno degli organizzatori o consultate le pagine: http://blog.phc.unipi.it/babygeometri/ http://gecogedi.dimai.unifi.it/seminars/ Mailing-list: babygeom(a)poisson.phc.unipi.it Saluti, Carlo Collari, Marco Moraschini e Nicoletta Tardini

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Seminari dei Baby-Geometri
by Nicoletta Tardini 05 Mar '17

05 Mar '17

Cari tutti, Mercoledì 08 Marzo alle 16:00 presso l'Aula Magna del dipartimento di matematica di Pisa si terrà il Seminario dei Baby-Geometri di Carlo Collari (Università di Firenze) dal titolo: "On a Bennequin-type inequality" di cui riporto l'abstract: "Let k be a knot (i.e. an embedding of $\mathbb{S}^1$ into $\mathbb{S}^3$). Once $\mathbb{S}^3$ is seen as the boundary of $\mathbb{D}^4$, one can ask which kind of (properly) embedded surfaces in $\mathbb{D}^4$ have k as boundary. Finding the minimal genus of such a surfaces (called slice genus) is a central topic in low dimensional topology. In this talk I wish to describe some inequalities, arising from contact topology and quantum homologies. These inequalities, called Bennequin-type inequalities, can be used to estimate the slice genus of a knot in term of other invariants. The seminar will be organized as follows; first, I will give a brief overview of the history of this problem, and indicate some motivations to study it. Then, I will describe some known results that may help to determine the slice genus of a knot. In doing so, I will introduce some basic contact topology. Finally, I will describe how we can use some ''contact'' knot invariant to estimate the slice genus." Tutti gli interessati sono invitati a partecipare. Per saperne di più sui prossimi seminari scrivete ad uno degli organizzatori o consultate le pagine: http://blog.phc.unipi.it/babygeometri/ http://gecogedi.dimai.unifi.it/seminars/ Mailing-list: babygeom(a)poisson.phc.unipi.it Saluti, Carlo Collari, Marco Moraschini e Nicoletta Tardini

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Geometria_Pisa March 2017