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Seminario Prof. N. Leonenko - Roma
by Luisa Beghin 28 Sep '18

28 Sep '18

*Seminario congiunto Università Sapienza - Tor Vergata, Roma* *Mercoledì 3 ottobre 2018* Ore 15:00, Aula 34 (iv piano) Dipartimento di Scienze Statistiche, Sapienza *Titolo: *Limit theorems, scaling of moments and intermittency for integrated finite variance supOU processes *Speaker:* Prof. N. Leonenko (Cardiff University, UK) *Abstract:* Superpositions of Ornstein-Uhlenbeck type (supOU) processes provide a rich class of stationary stochastic processes for which the marginal distribution and the dependence structure may be modeled independently. In this paper we investigate the limiting behavior of integrated supOU processes with finite variance. We show that after suitable normalization four different limiting processes may arise. The type of limit depends on the decay of the correlation function as well as on the characteristic triplet of the marginal distribution. SupOU processes, moreover, may exhibit intermittency, a phenomenon affecting the rate of growth of moments. We establish this rate for each of the four limiting scenarios. The rate changes at some point indicating that there is a change-point in the asymptotic behavior of absolute moments. For such a behavior to be possible, the moments in the limit theorem do not converge beyond some critical point. We show that this point is related to the dependence structure of the supOU process. The intermittency phenomenon appears also in some other models, for example, Intermittency of trawl processes. Joint work with D. Grahovac (Osijek University, Croatia) and M. Taqqu (Boston University, USA). Tutti gli interessati sono invitati ad intervenire. Cordiali saluti. Luisa Beghin *************************************************************** Luisa Beghin Dipartimento di Scienze Statistiche Fac. Ingegneria dell'Informazione, Informatica e Statistica "SAPIENZA" Università di Roma Piazzale Aldo Moro 5, 00185 Roma T (+39) 06 49910543 F (+39) 06 4959241 https://sites.google.com/site/luisabeghin/ *****************************************************************

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Annuncio di seminario a Roma La Sapienza
by Faggionato, Alessandra 27 Sep '18

27 Sep '18

Martedi` 2 Ottobre, ore 14.00 Aula di Consiglio, Dipartimento di Matematica, La Sapienza Speaker: F. Patras (University of Nice) Title: Revisiting chaos expansions and Wick products Abstract: Recently, the interest in the structure of cumulants and Wick products for non-Gaussian variables has been revived, since they both play important roles in M. Hairer’s theory of regularity structures. We present a new approach to the theory based on tools (group actions, Hopf algebras) that allow to understand the theory of Wick products as a deformation, a presentation from which many of their properties follow easily. We also discuss how these ideas appear in the theory of regularity structures. Based on j.w. with K. Ebrahimi-Fard, N. Tapia, L. Zambotti. Cordiali saluti Alessandra Faggionato ************************************************* Prof. Alessandra Faggionato http://www1.mat.uniroma1.it/~faggionato/ Department of Mathematics University "La Sapienza" Piazzale Aldo Moro, 5 00185 - Rome Office 5, Phone (0039) 06 49913252 *************************************************

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Premio Cuozzo
by Lucia Caramellino 27 Sep '18

27 Sep '18

L’Università di Roma “Tor Vergata” indice una selezione pubblica, per titoli ed eventuale colloquio, per il conferimento di un premio di studio intitolato “Michele Cuozzo” (11° edizione) destinato ai candidati che abbiano conseguito il titolo di dottore di Ricerca in Matematica presso un’università italiana. Il bando è disponibile all'indirizzo https://www.mat.uniroma2.it/~lucia/Docs_avvisi-dip/PremioCuozzo2018_prot.pdf <https://www.mat.uniroma2.it/~lucia/Docs_avvisi-dip/PremioCuozzo2018_prot.pdf> Scadenza: 26 Ottobre 2018, ore 12:00 +++++++++++++++++++++++++++++ Lucia Caramellino Dipartimento di Matematica Università di Roma “Tor Vergata” Via della Ricerca Scientifica 1 00133 Roma www.mat.uniroma2.it/~caramell <http://www.mat.uniroma2.it/~caramell>

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Autumn School “From interacting Particle systems to Kinetic equations: modelling, control and numerical methods”
by Luca di persio 27 Sep '18

27 Sep '18

Dear colleagues We are happy to announce the following Autumn School *“From interacting Particle systems to Kinetic equations: **modelling, control and numerical methods”* to be held* from* *26th to 30th, November *in* Verona, Italy.* The school is addressed to PhD, and last year master students, and organized in *3 mini-courses*, - "Agent Models of 1st and 2nd order: From micro to macro <https://unimathverona.wixsite.com/optke/carrillo>", José A. Carrillo (Imperial College London); - "Mean-Field optimal control and other types of games <https://unimathverona.wixsite.com/optke/fornasier>", Massimo Fornasier (TU München); - "Efficient Numerical Methods for Kinetic Equations <https://unimathverona.wixsite.com/optke/hu>", Jingwei Hu (Purdue University); and *3 focused **seminars* with tutorial sessions, - "Numerical Methods for Control and Games over Multiscale Agent-Based Models" <https://unimathverona.wixsite.com/optke/kalise>, Dante Kalise (Imperial College London); - "Herding Sheep - a mathematical approach" <https://unimathverona.wixsite.com/optke/totzeck>, Claudia Totzeck (TU Kaiserslautern); - "Uncertainty Quantification for Kinetic Equations of the Collective Behavior <https://unimathverona.wixsite.com/optke/zanella>", Mattia Zanella (Politecnico di Torino). Registration is free but mandatory, and places available are limited. For additional informations refer to the dedicated web-site: https://unimathverona.wixsite.com/optke/, Please, feel free to forward this announcement to people who might be interested in the school. Hope to seeing you in Verona! The local organizers, Giacomo Albi, Ph.D. Dept. of Computer Science University of Verona web: giacomoalbi.com <http://www.giacomoalbi.com/> __ Luca Di Persio - PhD College of Mathematics Dept. of Computer Science - University of Verona strada le Grazie 15 - 37134 Verona - Italy Tel : +39 045 802 7968 <http://www.hpa8.com/>

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Seminario F. Caravenna - Univ. Bocconi, Milano
by Antonio Lijoi 24 Sep '18

24 Sep '18

DEC-Statistics Seminar @ Bocconi University, Milano Thursday, September 27 12:30 Meeting room 3-e4-sr03, Via Roentgen 1, 3rd floor Francesco Caravenna (Universita' degli studi di Milano - Bicocca) Title: Local large deviations and the strong renewal theorem Abstract: We present two different, but related results for random walks with heavy tails (more precisely: in the domain of attraction of a stable law with infinite mean). The first result is a local large deviation upper bound, which improves on the classical local central limit theorem. The second result is the derivation of necessary and sufficient conditions for the so-called strong renewal theorem, which is the analogue of Blackwell's renewal theorem in the case of infinite mean. This solves a long standing problem, which dates back to a classical paper by Garsia and Lamperti (Comment. Math. Helv. 1962). (Based on joint work with Ron Doney) The DEC statistics seminars schedule is available at http://www.unibocconi.eu/statseminar ---------- Please note: If you are a guest and you do not have a Bocconi ID Card to access to the Bocconi Buildings, please communicate your participation by sending an email to arianna.colombo(a)unibocconi.it In addition, we suggest to print, fill out and send the attached form (to give your consent to personal data handling) via email to the same address. In this way, the check-in procedure at the entrance will be faster and easier.

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Seminario di Lorenzo Taggi a Roma Tre il 3/10/18 h16
by Pietro Caputo 24 Sep '18

24 Sep '18

Annuncio di Seminario Speaker: Lorenzo Taggi (TU Darmstadt, Germania) Titolo: Conservative interacting particle systems: "Oil and Water" and "Activated Random Walk". Mercoledi' 03 Ottobre 2018 ORE 16:00 Dipartimento di Matematica e Fisica Universita' degli Studi Roma Tre Largo San Leonardo Murialdo,1 - Pal.C - Aula 211 Abstract We consider two interacting particle systems, Activated Random Walk (ARW) and Oil and Water (OW). One of the main features of these systems is that the number of particles is conserved: This conservation law introduces hard-core constraints and long-range correlations which make the mathematical analysis particularly challenging. In this talk the main questions and results concerning these models are presented: In ARW, if the particle density is small enough, the activity dies out with time, while if the particle density is large enough the activity is sustained; moreover a non-trivial characterization of the critical density is available. Contrary to ARW, no phase transition occurs in OW: The activity dies out with time does not matter how large the particle density is. Based on joint works with E. Candellero and A. Stauffer.

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avviso di seminario: Prof. N.N. Leonenko
by Enrica Pirozzi 24 Sep '18

24 Sep '18

-------------- AVVISO di SEMINARIO Fractional Pearson Diffusions and Continuous Time Random Walks Prof. N.N. Leonenko School of Mathematics, Cardiff University, UK Abstract: We define fractional Pearson diffusions by non-Markovian time change in the corresponding Pearson diffusions. They are governed by the time-fractional diffusion equations with polynomial coefficients depending on the parameters of the corresponding Pearson distribution. We present the spectral representation of transition densities of fractional Pearson diffusions, which depend heavily on the structure of the spectrum of the infinitesimal generator of the corresponding non-fractional Pearson diffusion. Also, we present the strong solutions of the Cauchy problems associated with heavy-tailed fractional Pearson diffusions and the correlation structure of these diffusions. Continuous time random walks have random waiting times between particle jumps. We define the correlated continuous time random walks (CTRWs) that converge to fractional Pearson diffusions (fPDs). The jumps in these CTRWs are obtained from Markov chains through the Bernoulli urn-scheme model and Wright-Fisher model. The jumps are correlated so that the limiting processes are not Lévy but diffusion processes with non-independent increments. The waiting times are selected from the domain of attraction of a stable law. Il seminario si terrà il giorno 27 Settembre 2018 ore 15:00 nella Aula G terzo livello del Dipartimento Matematica e Applicazioni, Università di Napoli FEDERICO II, Complesso di Monte Sant'Angelo, Via Cintia, Napoli. Enrica Pirozzi ------------------ -- Enrica Pirozzi Dipartimento di Matematica e Applicazioni Universita' di Napoli FEDERICO II Via Cintia, Monte S.Angelo, 80126, NAPOLI, ITALY Tel. 081 675634 https://www.docenti.unina.it/ENRICA.PIROZZI

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Seminar at Dep. of Economics - Verona, 27 September 2018, Giacomo Bormetti
by Alessandro Gnoatto 24 Sep '18

24 Sep '18

Dear all, On Thursday 27 September 2018 at 12.00 - Polo Santa Marta, Via Cantarane 24, Sala Vaona Prof. Giacomo Bormetti - University of Bologna will give the seminar "Modeling correlation dynamics with canonical Vines" Abstract: When modeling correlation dynamics, tackling the issue of positive definiteness is a challenging task. At high frequencies in a multivariate financial setting, observational noise and asynchronicity makes the goal even more difficult. After reviewing different observation-driven approaches available in literature, I will focus on a recently proposed modeling framework based on regular vines. Please also find attached the full list of our Finance seminars. Feel free to forward this announcement to your colleagues. Best Regards, -- Prof Alessandro Gnoatto, PhD Dipartimento di Scienze Economiche Università degli Studi di Verona Via Cantarane 24 37129, Verona, Italy Room 1.05 Tel: +39 045 802 8537 Homepage: www.alessandrognoatto.com E-mail: alessandro.gnoatto(a)univr.it -------------------------------------------------- View my research on my SSRN Author page: http://ssrn.com/author=1615989 --------------------------------------------------

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Position at Luxembourg University (repost)
by Giovanni Peccati 21 Sep '18

21 Sep '18

Dear All, I would like to announce once again the opening of a very attractive full professor position in data science at Luxembourg University. A detailed discussion can be found here https://wwwen.uni.lu/university/news/slideshow/university_receives_2_5_mill… together with a link to the application page. Best regards, GP -- Prof. Giovanni Peccati ------------------------------------------ UR en Mathématiques Faculté des Sciences, de la Technologie et de la Communication ------------------------------------------ Université du Luxembourg ----------------------------------------- homepage: http://sites.google.com/site/giovannipeccati/Home E-mail: giovanni.peccati(a)gmail.com

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Scaling limits & SPDEs, Cambridge, 10-14 dec 2018
by A. Giuliani 20 Sep '18

20 Sep '18

Dear colleague, this is an announcement of the workshop `Scaling limits & SPDEs: recent developments and future directions' which will be held at the Isaac Newton Institute (INI) for Mathematical Sciences in Cambridge, UK, from December 10 to 14, 2018, see http://www.newton.ac.uk/event/srqw03 [www.newton.ac.uk] We invite all the interested participants to register as soon as possible on the website. DEADLINE FOR APPLICATIONS IS **SEPTEMBER 30, 2018** There is limited financial support available for students and young researchers; if you wish to apply for a grant, please indicate it in the application form. The workshop is the closing event of the 4-months programme `Scaling limits, rough paths, quantum field theory', which will be held at INI from September 3, to December 21, 2018, see https://www.newton.ac.uk/event/srq [www.newton.ac.uk] The confirmed speakers are: Cedric Bernardin Iwan Corwin Jean-Dominique Deuschel Franco Flandoli Yan Fyodorov Christophe Garban Gianbattista Giacomin Alessandro Giuliani Martin Hairer Claudio Landim Pierre Le Doussal Ian Melbourne Eveliina Peltola Jeremy Quastel Remi Rhodes Slava Rychkov Makiko Sasada Hao Shen Panagiotis Souganidis Herbert Spohn Hendrik Weber Weijun Xu Please forward this announcement to all the potentially interested colleagues and students. Thanks and best regards, Patricia Goncalves Antti Kupiainen Felix Otto Jeremy Quastel

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