- Random - Mailing list — Dipartimento di Matematica, UniPI

Annuncio seminario Galves 14/01/2020 RM1
by Nappo, Giovanna 09 Jan '20

09 Jan '20

SEMINARIO DI PROBABILITA’ E STATISTICA MATEMATICA IL giorno 14/01/2020, alle ore 14 nell’Aula di Consiglio del Dipartimento di Matematica, Sapienza Università di Roma Il prof. Antonio Galves dell’Universidade de Sao Paulo terrà una conferenza dal titolo ESTIMATING THE INTERACTION GRAPH OF STOCHASTIC NEURAL DYNAMICS Abstract: We address the question of statistical model selection for a class of stochastic models of biological neural nets.Models in this class are systems of interacting chains with memory of variable length. Each chain describes the activity of a single neuron, indicating whether it spikes or not at a given time. The spiking probability of a given neuron depends on the time evolution of its presynaptic neurons since its last spike time. When a neuron spikes, its potential is reset to a resting level and postsynaptic current pulses are generated, modifying the membrane potential of all its postsynaptic neurons. The relationship between a neuron and its pre- and postsynaptic neurons defines an oriented graph, the interaction graph of the model. The goal is to estimate this graph based on the observation of the spike activity of a finite set of neurons over a finite time. We provide explicit exponential upper bounds for the probabilities of under- and overestimating the interaction graph restricted to the observed set and obtain the strong consistency of the estimator. Our result does not require stationarity nor uniqueness of the invariant measure of the process. Joint work with A. Duarte, E. Locherbach and G. Ost.

1 0

Seminar in Pisa, January 13th 2020
by Dario Trevisan 09 Jan '20

09 Jan '20

Dear all, happy 2020! I would like to announce the following seminar by G. Poly (U. Rennes 1). Best, Dario Trevisan #### time and place: Monday 13th January 2020, 14:00, sala Riunoni (dip. Matematica, università degli studi di Pisa, Pisa). speaker: Guillaume Poly (U. Rennes 1) title: Around Salem-Zygmund Central Limit Theorem and application to roots of random trigonometric polynomials abstract: We shall revisit the Salem-Zygmund Central limit Theorem and get several generalizations: a speed of convergence via Stein's method, a functional counterpart and extension to total variation topology. As an application we prove the almost-sure convergence of the empirical measure of the number of real roots of a random trigonometric polynomial under-mild conditions on the coefficients. This is a joint work with Jurgen Angst.

1 0

extended deadline post doc applications in Graz
by Daniela Bertacchi 08 Jan '20

08 Jan '20

DEADLINE EXTENSION ! Open Assistant position (PostDoc) for 2 1/2 years Graz University of Technology, Austria Institute of Discrete Mathematics Working Groups Structure Theory and Stochastics & Noncommutative Structures (Wolfgang Woess & Franz Lehner) Scheduled to start on March 1, 2020. Requirements: PhD in Mathematics or Technical Mathematics, awarded before the beginning of the engagement. Desired qualifictations: scientific interest in the fields of Stochastic Processes (random walks) and their analytic counterparts, Graph Theory, Geometric Group Theory and Noncommutative Probability, possibly combining those topics. Readiness to collaborate in research projects in these areas. Workload 40 hours/week. Teaching duties of 4 hours per week per semester, in particular for Mathematics in the Engineering sciences, in German (!). For details + how to apply, see https://www.math.tugraz.at/~woess/position EXTENDED DEADLINE FOR APPLICATIONS: January 19, 2020. Wolfgang Woess Institut fuer Diskrete Mathematik, Technische Universitaet Graz, Steyrergasse 30, A-8010 Graz, Austria email: woess(a)TUGraz.at http://www.math.TUGraz.at/~woess <http://www.math.tugraz.at/~woess>

1 0

Seminario di M. Gordina alla Sapienza
by Faggionato, Alessandra 08 Jan '20

08 Jan '20

Buongiorno sotto l'annuncio di un seminario per Lunedi' 13 Gennaio Grazie Saluti Alessandra ************************************************************************************** When: Monday 13 January, 16.00 Where: Sala di Consiglio, Department of Mathematics, University La Sapienza Speaker: Maria Gordina (University of Connecticut) Title: Ergodicity for Langevin dynamics with singular potentials Abstract: We discuss Langevin dynamics of N particles on R^d interacting through a singular repulsive potential, such as the Lennard-Jones potential, and show that the system converges to the unique invariant Gibbs measure exponentially fast in a weighted total variation distance. The proof relies on an explicit construction of a Lyapunov function using a modified Gamma calculus. In contrast to previous results for such systems, our results imply geometric convergence to equilibrium starting from an essentially optimal family of initial distributions. This is based on join work with F.Baudoin and D.Herzog. -- ************************************************* 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 *************************************************

1 0

5-year Lecturer/Assistant Professor in Financial Mathematics UCD School of Mathematics and Statistics
by Andrea Pascucci 07 Jan '20

07 Jan '20

University College Dublin is seeking to appoint a Lecturer/Assistant Professor (Above the Bar) in Financial Mathematics in the School of Mathematics and Statistics. Applicants should have expertise in Financial Mathematics or Computational Finance, or both. It is a 5-year post, commencing on 1st May 2020. The salary scale is €53,773-€84,544 per annum. For further details, and to apply, go to https://www.ucd.ie/workatucd/jobs/ (search under 'External Applicants'). The application period will close at 17:00hrs (local Irish time) on 24th January 2020. Regards, Adamaria Perrotta Programme Director of BSc. in Financial Mathematics UCD School of Mathematics and Statistics -- Adamaria Perrotta School of Mathematics and Statistics S2.85, Science South UCD, Belfield, Dublin 4 00 353 1 716 2590

1 0

Probability Seminar: Richard Kraaij (TUDelft) [Padova, Tue 14/01, 11am]
by Francesca Collet 07 Jan '20

07 Jan '20

*** Apologies for cross-posting *** Dear Colleagues, we would like to invite you to the following Probability seminar that will take place at the Department of Mathematics, University of Padova, on January 14. ____________________________________________________________________________________________________ DR. RICHARD C. KRAAIJ (Delft University of Technology) “Large deviations for weakly coupled slow-fast systems via the comparison principle of an associated Hamilton-Jacobi equation” 14 JANUARY (Tuesday), 11:00; ROOM 1BC50, Dipartimento di Matematica “Tullio Levi-Civita”, Via Trieste 63, Padova ABSTRACT. In statistical physics many interesting phenomena, e.g. behavior of systems at critical parameters or in the theory of hydrodynamic limits, arise from systems having multiple time-scales. A slow component is influenced by fast components, and as the number of interacting components tends to infinity, limiting results for the slow component are obtained in terms of `averaged' versions of the fast components. I will consider in my talk the fluctuations (large deviations) of coupled Markovian systems with two-time scales. These fluctuations can arise from two sources: fluctuations of the slow process itself, or fluctuations of the large time averages of the fast process, effectively leading to a competition of two fluctuation effects. To obtain the large deviation principle, we consider an associated Hamilton-Jacobi-Bellman equation of which the Hamiltonian is given in terms of the two fluctuation effects. We establish under mild conditions that this Hamilton-Jacobi-Bellman equation is well-posed, and as a consequence that we have a large deviation principle for a wide class of weakly coupled Markov processes. Based on joint work with Mikola Schlottke (Eindhoven, The Netherlands). ____________________________________________________________________________________________________ All of you are very welcome. Best regards, Francesca Collet

1 0

BAYSM 2020: registration and abstract submission are now open!
by Federico Camerlenghi 07 Jan '20

07 Jan '20

Dear all, the 5th Bayesian Young Statisticians Meeting, BAYSM2020, will take place in Kunming, China (June 26-27, 2020) as a satellite to the ISBA 2020 world meeting. BAYSM is the official conference of j-ISBA, the junior section of the International Society for Bayesian Analysis. It is intended for Ph.D. Students, M.S. Students, Post-Docs, Young and Junior researchers working in the field of Bayesian statistics, providing an opportunity to connect with the Bayesian community at large. Senior discussants will be present at each session, providing participants with hints, suggestions and comments to their work. Distinguished professors of the Bayesian community will also participate as keynote speakers, making an altogether exciting program. Registration is now open ( https://baysm2020.uconn.edu/registration ) and will be available with an early bird discount until May 1, 2020. The event will be hosted at the Science Hall of Yunnan University (Kunming, China) right before ISBA 2020 world meeting. BAYSM 2020 will include social events, providing the opportunity to get to know other junior Bayesians. Young researchers interested in giving a talk or presenting a poster are invited to *submit an extended abstract by March 29, 2020*. All the instructions for the abstract submission are reported at the page https://baysm2020.uconn.edu/call-dates Thanks to the generous support of ISBA, a number of travel awards are available to support young researchers. Keynote speakers: Maria De Iorio David Dunson Sylvia Frühwirth-Schnatter Xuanlong Nguyen Amy Shi Jessica Utts Confirmed discussants: Jingheng Cai Li Ma Fernando Quintana Francesco Stingo Anmin Tang Yemao Xia While the meeting is organized for and by junior Bayesians, attendance is open to anyone who may be interested. For more information, please visit the conference website: https://baysm2020.uconn.edu/ On behalf of the BAYSM2020 organizing committee -- Federico Camerlenghi Department of Economics, Management and Statistics University of Milano Bicocca, Milano, Italy. web-page: https://www.unimib.it/federico-camerlenghi

1 0

Seminari congiunti ASI - Dipartimento Matematica Tor Vergata
by Anna Vidotto 07 Jan '20

07 Jan '20

Annuncio Seminari congiunti ASI - Dipartimento Matematica Tor Vergata *9 Gennaio 2020* Aula Dal Passo, Edificio Sogene *Ore 14: Gianluca Polenta, ASI Space Science Data Centre* Title: Cosmology through CMB maps Abstract: The Cosmic Microwave Background is a fundamental source of information for cosmology. In the standard inflationary scenario, the CMB can be described to first order as a Gaussian random field on the sphere, and as such cosmological information is encoded in the two-point correlation function or in the angular power spectrum. To derive these quantities as well as the likelihood function needed to estimate the cosmological parameters, a number of estimators have been developed following different trade-off between optimality, unbiasedness, and computational resources, also depending on the characteristics of the dataset to be analysed. In this talk I will review the different classes of estimators used in the CMB data analysis, focusing in particular to the solutions adopted for the ESA Planck satellite, which produced CMB full sky maps of unprecedented quality. Finally, I will briefly discuss how CMB non-Gaussianity, isotropy, and those anomalies found in the analysis of Planck data can be used to further test the inflationary paradigm. *Ore 15: Domenico Marinucci, Department of Mathematics, University ofRome Tor Vergata* Title: Critical Points, Multiple Testing and Point Source Detection for Cosmological Data Abstract: In this talk, we shall review some mathematical issues arising in the analysis of Cosmic Microwave Background (CMB) radiation data; many of these issues can be related to the investigation of functionals of independent interest in random geometry. We will first review some results on harmonic analysis for spherical random fields, on the construction of spherical wavelets and on their stochastic properties; we will then show how to compute the asymptotic distribution of critical points for Fourier/wavelet components of random fields, and we will establish some ergodicity results, in the high-frequency limit. We will then investigate how to exploit these results to implement multiple testing procedures for detection of point sources (Galaxies) in CMB Data; the resulting tests will be shown to exhibit a number of optimality properties. Applications to CMB data from the Planck collaboration will also be briefly illustrated. --------- Anna Vidotto PostDoc Researcher Dipartimento di Matematica Università degli Studi di Roma Tor Vergata https://sites.google.com/view/annavidotto

1 0

Talk announcement, dos Reis, Tuesday Jan 7
by Mario Maurelli 07 Jan '20

07 Jan '20

Dear all, Sorry for cross-posting. I would like to announce the following talk: Time and place: Tuesday January 7, 2pm Dipartimento di Matematica, Universita' degli Studi di Milano [room TBC, another email will follow] via C. Saldini 50, Milano Speaker: Dr. Goncalo dos Reis (University of Edinburgh) Title: Ito type Chain rule for measure dependent random fields under full and conditional measure flows Abstract: We present several Itô-Wentzell formulae on Wiener spaces for real-valued functionals random field of Itô type depending on measures. We distinguish the full- and marginal-measure flow cases. Derivatives with respect to the measure components are understood in the sense of Lions. This talk is based on joint work with V. Platonov (U. of Edinburgh), see https://arxiv.org/abs/1910.01892 . Best regards Mario Maurelli

1 1

Reminder - workshop "Graphs and Randomness in Turin"
by Federico Polito 06 Jan '20

06 Jan '20

Dear colleagues, We would like to remind you about the upcoming workshop *Graphs and Randomness in Turin* January 20-21, 2020 Department of Mathematics "G. Peano", University of Torino, Italy For more information please see the webpage: https://sites.google.com/view/graphs-and-randomness-in-turin Registration is mandatory but free. To register please email tamas.makai(a)unito.it by January 15. With best regards, The organisers, Tamás Makai Federico Polito -- Federico Polito Department of Mathematics University of Torino Via Carlo Alberto, 10 10123, Torino, Italy Email: federico.polito(a)unito.it Tel: +39 011 6702862 Web: www.federicopolito.it

1 0