Geometria_Pisa

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Seminari domani e dopodomani
by Bruno Martelli 04 Feb '20

04 Feb '20

Buondì, Vi segnalo ben tre seminari di geometria nei prossimi due giorni. Avviso tecnico: per qualche motivo alcuni iscritti non riescono a mandare mail alla mailing list. Pur essendo amministratore non riesco a capirne il motivo. Vi chiederei quindi di mandarmi eventuali consigli su: 1) Come rimediare a questo problema, 2) Come creare una *semplice* mailing list ex novo usando siti esterni al dipartimento. Seguono le informazioni sui seminari: 05-Feb-2020 - 15:00 Aula Magna (Dip. Matematica) <http://www.dm.unipi.it/webnew/it/aula/aula-magna-dip-matematica> Curvatura e Theorema Egregium: un percorso storico intorno alle Disquisitiones Generales di Gauss <http://www.dm.unipi.it/webnew/it/seminari/curvatura-e-theorema-egregium-un-…> Alberto Cogliati Il seminario si propone di descrivere alcune tappe fondamentali che hanno condotto Gauss alla redazione finale delle sue Disquisitiones Generales circa Superficies Curvas (1827). Saranno analizzate, in particolare, due dimostrazioni del teorema di invarianza della curvatura che Gauss fornì nel breve arco di un biennio (la prima risale al 1825 e fu pubblicata solo postuma; la seconda è quella che ritroviamo nelle stesse Disquisitiones). Il confronto di tali dimostrazioni ci consentirà di svolgere alcune considerazioni intorno alle scelte metodologiche dello stesso Gauss e più in generale intorno al dibattito, cruciale per comprendere alcuni aspetti dello sviluppo storico della Geometria Differenziale nel corso dell'Ottocento, sulla legittimità dell'impiego degli strumenti dell'Analisi per affrontare e risolvere questioni di natura geometrica. 05-Feb-2020 - 16:30 Sala Riunioni (Dip. Matematica) <http://www.dm.unipi.it/webnew/it/aula/sala-riunioni-dip-matematica> Integral Picard group of moduli of smooth curves and quasi-polarized K3 surfaces <http://www.dm.unipi.it/webnew/it/seminari/integral-picard-group-moduli-smoo…> Andrea Di Lorenzo A celebrated result of Harer, Arbarello and Cornalba tells us that the integral Picard group of the moduli stack of smooth curves of fixed genus is freely generated by the class of the Hodge line bundle, at least over a characteristic zero ground field. So, what about positive characteristic? On the other hand, the Picard group of the stack of smooth, quasi-polarized K3 surfaces of fixed degree behaves quite differently: O'Grady showed that its rank increases with the increasing of the degree of the quasi-polarization, and recently it has been proved that Noether-Lefschetz divisors generate the rational Picard group. Does the same result hold true for the integral Picard group? In this talk I will present how equivariant intersection theory can shed some light on both these questions, at least in the case of low genus or low degree. 06-Feb-2020 - 16:15 Sala Seminari (Dip. Matematica) <http://www.dm.unipi.it/webnew/it/aula/sala-seminari-dip-matematica> Embedding hyperbolic manifolds <http://www.dm.unipi.it/webnew/it/seminari/embedding-hyperbolic-manifolds> Leone Slavich A complete hyperbolic n-manifold geodesically embeds if it realized a totally geodesic embedded hypersurface in an (n+1)-hyperbolic manifold. On one hand, we know no general obstruction to the fact that a hyperbolic manifold of dimension n>2 embeds, but showing explicitly that it does is often difficult. Moreover, showing that a hyperbolic manifold embeds is sometimes a useful tool to construct hyperbolic manifolds with prescribed topological properties. We will survey some results on embedding of hyperbolic manifolds which are based on arithmetic techniques and hold in all dimensions. These apply to many examples of arithmetic manifolds of simplest type, as well as to examples of non-arithmetic manifolds such as those constructed by Gromov and Piatetski-Shapiro. This proves that the growth rate, with respect to volume V, of commensurabilty classes of hyperbolic manifolds having a geodesically embedding representative of volume <V is super-exponential. This is joint work with Alexander Kolpakov and Stefano Riolo.

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Conference announcement - Negative curvature in Pisa
by Bruno Martelli 03 Feb '20

03 Feb '20

Dear colleague, We would like to announce the following conference: "Negative curvature in Pisa" Centro di Ricerca Matematica Ennio De Giorgi, Pisa, Italy 6-10 July 2020 Web page: http://www.crm.sns.it/event/466/ The aim of this conference is to bring together, in a pleasant and relaxing environment, mathematicians interested in negatively curved manifolds (with a special focus on hyperbolic ones) as well as in coarse notions of negative curvature for spaces and groups coming from geometric group theory. Registration is open until May 31. There are limited funds for financial support for young mathematicians. The deadline to apply for it is March 31. Registrations and applications can be made through the website (linked above). The list of invited speakers includes: Mikhail Belolipetsky (IMPA - to be confirmed) Nicolas Bergeron (ENS - to be confirmed) Mladen Bestvina (Utah) Francesco Bonsante (Pavia) Ken Bromberg (Utah) Laura Ciobanu (Edinburgh) Federica Fanoni (Paris-Est) James Farre (Yale) Elia Fioravanti (Oxford) Radhika Gupta (Bristol - to be confirmed) Irene Pasquinelli (Jussieu) Joan Porti (Barcelona) Alan Reid (Rice) Alessandro Sisto (ETH) Leone Slavich (Pavia) Juan Souto (Rennes) Organisers: Roberto Frigerio (Pisa) and Bruno Martelli (Pisa).

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Fwd: Postdoctoral position at Università di Firenze
by Bruno Martelli 03 Feb '20

03 Feb '20

Segnalo post-doc in geometria a Firenze. Bruno ---------- Forwarded message --------- From: Daniele Angella <daniele.angella(a)unifi.it> Date: Mon, Feb 3, 2020 at 8:59 AM Subject: Postdoctoral position at Università di Firenze To: <geometriaglobale(a)lists.math.unifi.it>, <geometria(a)lists.math.unifi.it>, <GEOMETRY(a)listserv.utk.edu>, <EAGER-GEN(a)listserv.dfn.de> Cc: Daniele Angella <daniele.angella(a)gmail.com> Postdoctoral position at Università di Firenze Deadline: 28 feb 2020 A postdoctoral position has been established at the Dipartimento di Matematica e Informatica "U. Dini", Università di Firenze, Italy. Strong candidates pursuing research on Real and Complex Manifolds, in the broadest sense, are warmly encouraged to apply within February 28, 2020. The duration of this position is one year, possibly extendable for one further year. Details for the application can be found at the following link (English version in the second half of the document): https://titulus.unifi.it/albo/viewer?view=files%2F003410128-UNFICLE-853d20e… This position has been established within the project PRIN 2017 "Real and Complex Manifolds: Topology, Geometry and holomorphic dynamics", code 2017JZ2SW5. Please circulate this announcement to potential candidates. For further information please contact: daniele.angella(a)unifi.it. All the best,

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Fwd: Bando posto RTDa MAT/03
by Bruno Martelli 31 Jan '20

31 Jan '20

Segnalo un posto da RTD A MAT/03 a Bologna. Scadenza 3 marzo. Bruno ---------- Forwarded message --------- From: Stefano Francaviglia <francaviglia(a)gmail.com> Date: Fri, Jan 31, 2020 at 12:01 PM Subject: Fwd: Bando posto RTDa MAT/03 To: Bruno Martelli <martelli(a)dm.unipi.it>, ROBERTO FRIGERIO < roberto.frigerio(a)unipi.it>, Gabriele Mondello <mondello(a)mat.uniroma1.it>, Francesco Bonsante <francesco.bonsante(a)unipv.it>, Alberto Saracco < alberto.saracco(a)gmail.com>, Riccardo Ghiloni <riccardo.ghiloni(a)unitn.it> diffontete stefano ---------- Forwarded message --------- Cari colleghi, comunico che è stato pubblicato il bando per il posto di RTDa del settore MAT/03 richiesto dal Dipartimento. Il bando è disponibile all'indirizzo https://www.unibo.it/it/ateneo/concorsi-e-selezioni/bandi-ricercatore-a-tem… Scadenza 3 marzo. Cordiali saluti Giovanni Dore

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Conferenza su 3-varietà aritmetiche ecc.
by Stefano Riolo 10 Jan '20

10 Jan '20

Buon giorno, Segnalo questa conferenza ad Hagen (23-27 marzo) su gruppi aritmetici e 3-varietà. La data scadenza per chiedere rimborsi di viaggio/alloggio è il 31 gennaio. https://hagen2020.group.shef.ac.uk Stefano

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Fwd: Postdoc position in Sydney
by Carlo Petronio 30 Dec '19

30 Dec '19

-------- Messaggio Inoltrato -------- Oggetto: Postdoc position in Sydney Data: Mon, 30 Dec 2019 04:56:10 +0000 Mittente: Jonathan Spreer <jonathan.spreer(a)sydney.edu.au> CC: joachim(a)unimelb.edu.au <joachim(a)unimelb.edu.au>, Stephan Tillmann <stephan.tillmann(a)sydney.edu.au> Dear Colleague, We are advertising a 2-year position in Geometry & Topology based at the University of Sydney. Could you please pass this message on to any students or others who might be interested? We are looking for someone to start in the middle of 2020; the exact starting date is quite flexible. The closing date for applications is 16 January, 11:30pm (Sydney time), and details can be found here: https://www.mathjobs.org/jobs/jobs/15460 Best regards, Hyam Rubinstein, Stephan Tillmann and Jonathan Spreer --- Dr Jonathan Spreer Lecturer and Early Career Development Fellow School of Mathematics and Statistics F07 The University of Sydney Carslaw Building, Room 606 https://www.maths.usyd.edu.au/u/jspreer/index.html

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concorso RTD-B Università del Salento (Lecce)
by Bruno Martelli 18 Dec '19

18 Dec '19

Boundì, è uscito ieri un bando per un posto da RTD-B in Geometria (MAT/03) presso l'Università del Salento. Qui il link: https://www1.unisalento.it/bandi-concorsi/-/bandi/view/65058965 Scadenza 16 gennaio 2020. Saluti, Bruno

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Seminario giovedì
by Bruno Martelli 17 Dec '19

17 Dec '19

Buondì, Vi annuncio l'ultimo seminario prima delle vacanze, sempre giovedì alle 16.15. A presto e buone feste, Bruno ----- 19-Dec-2019 - 16:15 Sala Seminari (Dip. Matematica) <http://www.dm.unipi.it/webnew/it/aula/sala-seminari-dip-matematica> Contact structures on lens spaces and their Stein fillings <http://www.dm.unipi.it/webnew/it/seminari/contact-structures-lens-spaces-an…> Edoardo Fossati SNS Pisa Everything has been said about Stein fillings of lens spaces when they are endowed with their standard (tight) contact structure. Nevertheless, lens spaces support many more tight structures, that are all classified, but for which a complete list of their Stein fillings is still missing. I will present a series of methods and techniques which can be used to investigate the topology of these fillings, giving constraints, for example, on their Euler characteristic and fundamental group.

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Fwd: [gdrtresses] post doc Regensburg starting 1/9/2020
by Bruno Martelli 16 Dec '19

16 Dec '19

Segnalo post-doc in low-dimensional topology/knot theory a Regensburg. A presto, Bruno ---------- Forwarded message --------- From: <greg.mcshane(a)gmail.com> Date: Mon, Dec 16, 2019 at 12:32 PM Subject: [gdrtresses] post doc Regensburg starting 1/9/2020 To: <gdrtresses(a)listes.math.cnrs.fr> Looking for a postdoc in the fields of low-dimensional topology/knot theory to join a DFG-funded Emmy Noether Independent Junior Research Group on "Quantum invariants, knot concordance and unknotting" at the University of Regensburg. Regensburg has a strong research group in low-dimensional and geometric topology, including Jonathan Bowden, Stefan Friedl, Clara Löh, Filip Misev and Raphael Zentner. The c position is initially for 18 months, but will most likely be extended for 6 months more. Starting date is September 1st 2020, or by agreement. Salary is TV-L E13 100%, i.e. roughly 2400 Euro net per month. plus ample travel funding, there are no teaching duties, and no knowledge of German is required. Applications (including a CV, a research statement, and the contact details of two referees in the text of your email) by email to lukas(a)lewark.de. Mid-January, applications will be reviewed until the position is filled. Among equally qualified applicants, preference will be given to applicants from groups that are underrepresented in mathematics. ---------------------------------------------------------------------------- Please contact me by email with any questions you might have. Best regards, Lukas Lewark -- lukas(a)lewark.de http://lewark.de/lukas/

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Seminario domani
by Bruno Martelli 11 Dec '19

11 Dec '19

Buondì, Vi annuncio il seminario di geometria di domani. A presto, Bruno ----- 12-Dec-2019 - 16:15 Sala Seminari (Dip. Matematica) <http://www.dm.unipi.it/webnew/it/aula/sala-seminari-dip-matematica> Splitting numbers <http://www.dm.unipi.it/webnew/it/seminari/splitting-numbers> Carlo Collari NYU Abu Dhabi The weak splitting number is the minimal number of crossing changes which are necessary to split the a link into a collection of disjoint knots. This invariant can be thought of as the (Gordian) distance between a link and the set of completely split links, and somehow as a measure of the complexity of a link. There is another version of the splitting number whose definition allows only crossing changes between different components. In this talk we shall illustrate various methods to compute the weak splitting number and the splitting number. In particular, I shall give a template to produce lower bounds on the weak splitting number, and provide some examples. The material discussed in this talk is joint work with A. Cavallo and A. Conway.

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Geometria_Pisa