February 2021 - Random - Mailing list — Dipartimento di Matematica, UniPI

Seminari Gruppo PRISMA
by c.ceci＠unich.it 22 Feb '21

22 Feb '21

Buongiorno a tutti, abbiamo il piacere di annunciare il secondo appuntamento del ciclo mensile di seminari online promosso dal Gruppo UMI PRISMA. Lunedi’ 1 marzo 2021, ore 16-18 Alessandra Faggionato Titolo: Random resistor networks and Mott’s variable range hopping Abstract: Random resistor networks allow to study electron transport indisordered systems. By means of stochastic homogenization one can characterize the infinite volume effective conductivity in terms of the homogenized matrix of suitable discrete Poisson equations. We will then focus on the low temperature behavior of the random conductance model and the Miller-Abrahams random resistor network. The latter models the so-called Mott’s variable range hopping, a fundamental transport mechanism in disordered solids in the regime of strong Anderson localization. We will discuss its percolative properties and show how homogenization, percolation and scaling arguments lead to Mott’s law. (For the percolation part, the talk is based on joint works with H.A. Mimun). Elisabetta Candellero Titolo: Competition processes on hyperbolic non-amenable graphs Abstract: We consider two first-passage percolation processes, FPP_1 and FPP_\lambda, spreading with rates 1 and \lambda respectively, on a graph G with bounded degree. FPP_1 starts from a single source, while the initial configuration of FPP_\lambda consists of countably many seeds distributed according to a product of iid Bernoulli random variables of parameter \mu on the set of vertices. This model is known as "First passage percolation in a hostile environment" (FPPHE), and was introduced by Stauffer and Sidoravicius as an auxiliary model for investigating a notoriously challenging model called Multiparticle Diffusion Limited Aggregation. We consider several questions about FPPHE, focusing on the case when G is a non-amenable hyperbolic graph. This talk is based on joint works with Alexandre Stauffer. Collegamento Teams: https://teams.microsoft.com/l/meetup-join/19%3ameeting_YjVhZDc3MDctZTU1NC00… Tutte le informazioni le trovate anche alla pagina: http://www.umi-prisma.polito.it/webinars.html Grazie per l’attenzione, Claudia Ceci e Domenico Marinucci **************************************** Claudia Ceci Dipartimento di Economia Universita' "G. d'Annunzio" V.le Pindaro 42 65127, Pescara, ITALY c.ceci(a)unich.it ****************************************

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Three two-year postdoctoral fellowships -- Torino, Italy
by Federico Polito 21 Feb '21

21 Feb '21

The Department of Mathematics "G. Peano" (University of Torino) invites applications for *three two-year postdoctoral fellowships* in all areas of applied and pure mathematics. The winners will work with researchers of the department in all areas of mathematics, including Probability and Statistics. The call is online at https://pica.cineca.it/unito/ Look for "Bando assegni di ricerca - Cofinanziati - Tornata XXIII" and click the left blue button (Bando/call). For the application procedure choose instead the button on the right (Le tue domande/your applications -- the application is then available in English). *The closing date is March 8, 2021 (1pm CET)* The dates and location of the interviews will be published at https://www.serviziweb.unito.it/albo_ateneo/ For any enquiries in the area of probability please feel free to email me. Best regards, Federico Polito -- Federico Polito Department of Mathematics University of Torino Via Carlo Alberto, 10 10123, Torino, Italy Email: federico.polito(a)unito.it Web: www.federicopolito.it

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Tenure Track position in Financial Mathematics – University of Verona
by Alessandro Gnoatto 20 Feb '21

20 Feb '21

The Department of Economics at the University of Verona is looking for a tenure track researcher in the field of Financial and Insurance Mathematics (SECS-S/06 - 13/D4). The Department of Economics offers a vibrant research environment in the newly built campus of Santa Marta. According to the latest Italian Research Assessment Exercise (VQR), it ranks in the top 5% of the economics departments for the number of academics with only top publications and, according to REPEC, is in the top 10% in Italy for the proportion of cited publications. The Verona Quantitative Finance group offers a stimulating environment with researchers focusing on different areas such as: high frequency financial econometrics and asset pricing, mathematical/quantitative finance, stochastic optimal control and computational finance. The position is a fixed-term 3-year position (RTDB). If the researcher receives the National Scientific Habilitation (ASN), at the end of the 3 years then he/she becomes a tenured Associate Professor. A minimum of 3 years of postdoc experience is required together with a working knowledge of Italian. The call and the online application form can be accessed via the following link. https://www.univr.it/it/concorsi/personale-docente/ricercatore/ricercatore-… <https://www.univr.it/it/concorsi/personale-docente/ricercatore/ricercatore-…> For questions, please contact: alessandro.gnoatto(a)univr.it <mailto:alessandro.gnoatto@univr.it>

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Bernoulli Society New Researcher Award 2022
by Antonio DI CRESCENZO 19 Feb '21

19 Feb '21

Bernoulli Society welcomes applications for the New Researcher Award 2022. The deadline for applications is 15 March 2021. Each awardee shall deliver a talk at a special invited session during the 42nd Conference on Stochastic Processes and their Applications in 2022, and will receive a funding up to 1000€ to offset travel and other expenses. Eligible candidates are active researchers in Probability Theory who obtained their PhD degree on or after March 1st, 2016, and who are regular members of the Bernoulli Society. Candidates should apply through the web form https://docs.google.com/forms/d/e/1FAIpQLSdajP4NBGSWFXHJxoVCQTmJMpv9rM2ZRNV… For more information, visit the website http://www.bernoulli-society.org/news/37-general-announcement/324-bernoulli… -- Antonio Di Crescenzo

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Two associate professor positions in Stockholm
by Martina Favero 19 Feb '21

19 Feb '21

Dear all, Two positions as associate professor in mathematics (specialization in mathematical statistics) are open at KTH, Stockholm. The two positions differ slightly in the subject description, see https://www.kth.se/en/om/work-at-kth/lediga-jobb/what:job/jobID:375477 and https://www.kth.se/en/om/work-at-kth/lediga-jobb/what:job/jobID:375478 for more details. The deadline for application is April 9, 2021. Best wishes, Martina Favero

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Seminar announcement
by Marco Scarsini 19 Feb '21

19 Feb '21

Thursday, 25 February, 17:00 CET *Daniela Saban,* Stanford University Online Assortment Optimization for Two-sided Matching Platforms <http://mailsender.luiss.it/lists/lt.php?id=cRpQAAwDSAUFBQBOVgFdBQs> Discussants: Will Ma and Antoine Désir The paper can be found here <https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3712553>. This is the link to the Virtual Room <http://mailsender.luiss.it/lists/lt.php?id=cRpQAAYBSAUFBQBOVgFdBQs> The schedule of the upcoming seminars can be found here <https://economiaefinanza.luiss.it/en/seminari/prossimi-seminari>. If you want to receive announcements of future seminars, please fill out this form <https://docs.google.com/forms/d/e/1FAIpQLSeDxM-M5ogG43elgjC-lNCp0BDhISiZHG0…> . ******************************************************* Marco Scarsini Dipartimento di Economia e Finanza Luiss Viale Romania 32 00197 Roma, ITALY URL: http://docenti.luiss.it/scarsini/

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Padova Online Seminar by Luca Avena (Leiden University) [Friday, Feb. 26 at 14.30]
by alessandra bianchi 19 Feb '21

19 Feb '21

Dear Colleagues, We would like to invite you to the following Probability seminar that will take place on February 26 at 14.30 by the zoom platform. ________________________________________________________ Speaker: Luca Avena (Leiden University) Title: Node immunization in networks: a scalable searching algorithm based on random rooted forests 26 FEBRUARY (Friday) - 14:30 zoom link: TBA available on the webpage https://www.math.unipd.it/~bianchi/seminari/ ) Abstract: We are interested in the so-called multiple-node immunization for complex networks under attack of a viral agent. The latter is a hot topic in network science and it consists of identifying and removing a set of nodes of a given size in a graph to maximally impede the agent spread. Several approaches have been proposed in the literature based on numerical and theoretical insights on how classical models for virus spread (so-called compartmental models) evolve on graphs. Based on the stability analysis of these compartmental models, the maximal eigenvalue of the adjacency matrix of the graph has been proposed as a measure for how resilient the network is. Thus one of the most common approaches for immunization consists in identifying the set of nodes of a given cardinality, for which the reduced network, obtained by removing these nodes, has minimal largest eigenvalue. This optimization problem turns out to be a computationally hard problem in the well known NP class and the available exact or proxy algorithms offer good solutions and performances only for small data sets. We propose a novel randomized flexible method to efficiently identify these sets of nodes based on random walk kernels and random rooted forests. We explain the theoretical results underlying the method, and present experimental results where we test method and performances on classical synthetic and real-world benchmarks. Joint work with Michael Emmerich, Alex Gaudilliere and Irina Gurewitsch -- Alessandra Bianchi Dip. di Matematica Università di Padova Via Trieste, 63 - 35121 Padova, Italy phone: +39 049 827 14 06 fax: +39 049 827 14 28 e-mail: bianchi(a)math.unipd.it http://www.math.unipd.it/~bianchi/

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Webinar in Statistics YUN WEI - 26/2, ore 17
by Pierpaolo De Blasi 19 Feb '21

19 Feb '21

WEBINARS IN STATISTICS @ COLLEGIO CARLO ALBERTO <https://www.carloalberto.org/events/category/seminars/seminars-in-statistic…> Venerdi 26 Febbraio 2021, alle ore 17:00, si terrà il seguente webinar: ------------------------------------------------ Speaker: *Yun Wei (*Samsi and Duke University, USA) Title: *Obtaining faster convergence rates in finite mixture models by taking repeated measures* Zoom link: https://us02web.zoom.us/j/89954920036?pwd=dndsQnZqQ2crZzVlRW1pM0Q2RGo1Zz09 Meeting ID: 899 5492 0036 Passcode: 418668 Abstract: It is known that some finite mixture models suffer from slow rates for estimating the component parameters. Examples are mixtures of the weakly identifiable families in the sense of [Ho and Nguyen 2016]. To obtain faster parameter convergence rates, we propose to collect more samples from each mixture component, hence each data is a vector of samples from the same mixture component. Such a model is known in the literature as a finite mixture model of repeated measures, which has been applied in psychological study and topic modeling. This model also belongs to the mixture of product distributions, with the special structure that the product distributions in each mixture component are also identical. In this setup, each data consists of conditionally independent and identically distributed samples and thus is an exchangeable sequence. We show that by taking repeated measures (collecting more samples from each mixture component), a finite mixture model that is not originally identifiable becomes identifiable. Moreover, the posterior contraction rates for the parameter estimation are also obtained, demonstrating that repeated measures are beneficial for estimating the component parameters. Our results hold for general probability families including all regular exponential families and can also be applied to hierarchical models. The key tool to develop the results is by establishing an inverse inequality to upper bound a suitable distance between mixing measures by the total variational distance between the corresponding mixture densities. Based on joint work with Xuanlong Nguyen (University of Michigan). ------------------------------------------------ Il webinar è organizzato dalla "de Castro" Statistics Initiative www.carloalberto.org/stats in collaborazione con il Collegio Carlo Alberto e rientra nel Complex Data Modeling Research Network midas.mat.uc.cl/network Cordiali saluti, Pierpaolo De Blasi --- University of Torino & Collegio Carlo Alberto carloalberto.org/pdeblasi <https://sites.google.com/a/carloalberto.org/pdeblasi/>

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Fwd: PhD at the Scuola Normale Superiore (Pisa, Italy). Call 2021-2022
by Fabrizio Lillo 18 Feb '21

18 Feb '21

The call for applications to the 2021/2022 PhD program in *Computational Methods and Mathematical Models for Sciences and Finance* at the Scuola Normale Superiore, Pisa, see https://www.sns.it/en/computational-methods-and-mathematical-models-for-sci… ., is available here https://www.sns.it/en/admissions/phd/how-to-apply-for-the-phd-courses Please distribute this information to potentially interested candidates. Thank you very much in advance. ---------------------------------------- Fabrizio Lillo Dipartimento di Matematica, Università di Bologna Scuola Normale Superiore, Pisa ITALY Personal website: fabriziolillo.wordpress.com University website: www.unibo.it/sitoweb/fabrizio.lillo <http://fabriziolillo.wordpress.com/> phone: +39 050509159

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Fwd: [owps] One World Probability Seminar Thursday February 18, 2021
by Faggionato, Alessandra 17 Feb '21

17 Feb '21

Buongiorno, inoltro l'annuncio del OWPS di domani. Saluti Alessandra ---------- Forwarded message --------- Da: One World Probability <ow.probability(a)gmail.com> Date: mer 17 feb 2021 alle ore 10:50 Subject: [owps] One World Probability Seminar Thursday February 18, 2021 To: <owps(a)lists.bath.ac.uk> Tomorrow's speaker in the One World Probability Seminar is (Note: all times are in UTC. *Due to time changes, you should check what that translates to in your location*) ------------------------------------------------ (14:00-16:00 UTC) Speaker: Richard Kenyon (Yale) Title: The multi-tiling model Abstract: Given a graph G and collection of connected subgraphs T (called tiles), we consider covering G with copies of tiles in T so that each vertex of G is covered with a predetermined multiplicity. The multitiling model is a natural probability measure on such configurations. In the limit of large multiplicities we compute the asymptotic growth rate of the number of multitilings: the free energy of the multitiling model. We will show that the individual tile densities tend to a Gaussian field with respect to an associated discrete Laplacian. We also find an exact discrete Coulomb gas limit when we vary the multiplicities. This is joint work with Andrei Pohoata (Yale). Please note: Richard Kenyon will be giving both talks in the session. ------------------------------------------------ The zoom link will appear the day before on the OWPS website: https://www.owprobability.org/one-world-probability-seminar <https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.owpro…> It can also be directly accessed through the link below: https://uniroma1.zoom.us/j/83228198137?pwd=QUxhM1NXdlFTOGxvc09IUGIvenBxUT09 <https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Funiroma1.…> Meeting-ID: 832 2819 8137 Passcode: 029896 Please feel free to circulate this email. We hope to see you all tomorrow! One World Probability Team -- ************************************************* 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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