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online seminar - Angelo Lucia - Mixing time of quantum Gibbs samplers
by Carbone Raffaella 07 Apr '21

07 Apr '21

Dear colleagues, it is our pleasure to invite you to the following seminar Speaker: *Angelo Lucia* Title: *Mixing time of quantum Gibbs samplers* Time: Wednesday, *April 14*, 5PM (Italian time) The abstract follows below in this message. Zoom Link for the seminar <https://us02web.zoom.us/j/86771523774?pwd=SitEVEhPSGRlaEkxTHZmQk9rTmlLZz09> The seminar is a satellite activity of the PhD course "Introduction to coercive inequalities with applications in analysis and probability theory" (professor Boguslaw Zegarlinski - Imperial College, London) Best regards, Raffaella Carbone Abstract. Gibbs samplers are Markovian semigroups whose evolution converges towards the termal equilibrium of a given Hamiltonian (the Gibbs state). The time that the evolution takes, in the worst case, to converge close to the thermal state is known as the mixing time. Knowing the mixing time of a process is useful for many applications, and it can be estimated with various functional inequalities. In the case of classical spin systems on a lattice, it was shown that it is possible to determine the mixing properties of the semigroup from some "static" clustering condition of the thermal state. This suggests the question of whether the same is true for quantum spin systems. In this talk, I will focus on the specific case of Gibbs states of commuting Hamiltonians, and present some recent result in this direction. I will introduce the notion of quantum conditional relative entropy and show how it can be used to prove quasi-factorization (or approximate tensorization) properties of the quantum relative entropy. I will then show how these can be used to bound log-Sobolev constants for product semigroups with heath-bath generators, and under stronger assumptions in more general situations. -- Raffaella Carbone, PhD Probabilità e Statistica Matematica Dipartimento di Matematica dell'Università degli Studi di Pavia

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Postdoc position at Université Laval
by Marzia Angela Cremona 06 Apr '21

06 Apr '21

12-month postdoc fellowship from September 2021 (indicatively) at Université Laval (Quebec City), under the supervision of Marzia A. Cremona (Operation and Decision Systems Department) and Federico Severino (Finance Department). Research area: Functional motif discovery for financial time series. Requirements: * Background in statistics, econometrics, or data science. * PhD in related areas obtained less than 5 years ago. * Proficiency in R and programming skills. Primary goal: Generalize and adapt existing statistical learning methods for motif discovery in functional data, to detect and predict bubbles and recurrent patterns in financial time series. An important part of the work is computational. No teaching activity required. Yearly salary: 51 737 CAD (maximum possible salary according to the postdoc union collective agreement). Additional funds available for conference attendance. A small amount of teaching assistantship can provide extra salary. The candidate commits to move to Quebec City. In case public health conditions do not allow the moving, remote work can be considered. For information or to apply, contact marzia.cremona(a)fsa.ulaval.ca<mailto:marzia.cremona@fsa.ulaval.ca> or federico.severino(a)fsa.ulaval.ca<mailto:federico.severino@fsa.ulaval.ca> Marzia A Cremona Department of Operations and Decision Systems Université Laval T 418 656-2131, poste 412525 https://marziacremona.com<https://marziacremona.com/> Pavillon Palasis-Prince, local 2449 2325, rue de la Terrasse Québec (Québec) G1V 0A6

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Pisa Online Seminars - Laure Dumaz and Martin Vogel (Tuesday, April 13 at 16:00 and 17:00)
by Giacomo Filippo Di Gesu 06 Apr '21

06 Apr '21

Dear colleagues, I would like to invite you to the following online seminar organized by the Probability group of the University of Pisa. The two talks will be accessible under the link Click here to join the meeting<https://teams.microsoft.com/l/meetup-join/19%3Aaf3d635091e049579e555a84219a…> Best regards, Giacomo Tuesday, April 13, 16:00 Speaker: Laure Dumaz (École Normale supérieure) Title: Localization of the continuous Anderson hamiltonian in 1-d and its transition towards delocalization. Abstract: We consider the continuous Schrödinger operator - d^2/d^x^2 + B’(x) on the interval [0,L] where the potential B’ is a white noise. We study the entire spectrum of this operator in the large L limit. We prove the joint convergence of the eigenvalues and of the eigenvectors and describe the limiting shape of the eigenvectors for all energies. When the energy is much smaller than L, we find that we are in the localized phase and the eigenvalues are distributed as a Poisson point process. The transition towards delocalization holds for large eigenvalues of order L. In this regime, we show the convergence at the level of operators. The limiting operator in the delocalized phase is acting on R^2-valued functions and is of the form ``J \partial_t + 2*2 noise matrix'' (where J is the matrix ((0, -1)(1, 0))), a form appearing as a conjecture by Edelman Sutton (2006) for limiting random matrices. Joint works with Cyril Labbé. Tuesday, April 13, 17:00 Speaker: Martin Vogel (Université de Strasbourg) Title: Eigenvalue asymptotics and eigenvector localization for non-Hermitian noisy Toeplitz matrices Abstract: A most notable characteristic of non-Hermitian matrices is that their spectra can be intrinsically sensitive to tiny perturbation. Although this spectral instability causes the numerical analysis of their spectra to be extremely unreliable, it has recently been shown to be also the source of new mathematical phenomena. I will present recent results about the eigenvalues asymptotics and eigenvector localization for deterministic non-Hermitian Toeplitz matrices with small additive random perturbations. These results are related to recent developments in the theory of partial differential equations. The talk is based on joint work with J. Sjöstrand, and with A. Basak and O. Zeitouni. ************************ Giacomo Di Gesù Dipartimento di Matematica Università di Pisa Largo Bruno Pontecorvo 5 56127 - Pisa, Italy giacomo.digesu(a)unipi.it<mailto:giacomo.digesu@unipi.it> https://sites.google.com/site/giacomodigesu/

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Avviso di Seminario - PRISMA
by Domenico Marinucci 06 Apr '21

06 Apr '21

Cari Colleghi lunedì prossimo 12 Aprile dalle 16 alle 18 avrà luogo il prossimo incontro per il ciclo di seminari Prisma. Gli speaker saranno Marco Fuhrman e Andrea Cosso, qui sotto titoli, abstract ed il link al collegamento Teams. ---------------------------------------------------------------- Speaker: Marco Fuhrman (Università di Milano) Title: A new tool in stochastic optimal control: the randomization method. Abstract: In the first part of this talk I will present a survery on the relationships among classical stochastic optimal control problems, non-linear partial differential equations (the Hamilton-Jacobi-Bellman equations) and backward stochastic differential equations (BSDEs). In the second part, more specifically, I will introduce the so-called randomization method, which allows to associate an appropriate BSDE to a large class of optimal control problems. Among the possible generalizations, I will concentrate on optimal control of path-dependent equations, i.e. equations with general with memory effects. Speaker: Andrea Cosso (Università di Bologna) Title: Randomization method and path-dependent Hamilton-Jacobi-Bellman equation Abstract: In the present talk I will study a stochastic optimal control problem with path-dependent coefficients. I will exploit the so-called randomization method to derive a dynamic programming principle for the value function. This allows to prove that the value function is a viscosity solution to a path-dependent Hamilton-Jacobi-Bellman equation, involving the horizontal and vertical derivatives of functional Ito calculus. Finally, I will discuss the validity of the comparison principle for such a partial differential equation. Collegamento Teams: https://teams.microsoft.com/l/meetup-join/19%3a667d2414be564c5d8fba30acffeb… --------------------------------------------------------------------- Grazie per l'attenzione, Domenico Marinucci e Claudia Ceci

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Webinar in Statistics GILLES STUPFLER
by Pierpaolo De Blasi 05 Apr '21

05 Apr '21

WEBINARS IN STATISTICS @ COLLEGIO CARLO ALBERTO <https://www.carloalberto.org/events/category/seminars/seminars-in-statistic…> Venerdi 9 Aprile 2021, alle ore 12.00, si terrà il seguente webinar: ------------------------------------------------ Speaker: *Gilles Stupfler *(ENSAI Rennes and CREST, France) Title: *Asymmetric least squares techniques for extreme risk estimation* Zoom link: https://us02web.zoom.us/j/81720792366?pwd=QWtaYVRRejVSVGlOMXFMaDdsemxjdz09 Meeting ID: 817 2079 2366 Passcode: 241135 Abstract: Financial and actuarial risk assessment is typically based on the computation of a single quantile (or Value-at-Risk). One drawback of quantiles is that they only take into account the frequency of an extreme event, and in particular do not give an idea of what the typical magnitude of such an event would be. Another issue is that they do not induce a coherent risk measure, which is a serious concern in actuarial and financial applications. In this talk, I will explain how, starting from the formulation of a quantile as the solution of an optimisation problem, one may come up with two alternative families of risk measures, called expectiles and extremiles. I will give a broad overview of their properties, as well as of their estimation at extreme levels in heavy-tailed models, and explain why they constitute sensible alternatives for risk assessment using some real data applications. This is based on joint work with Abdelaati Daouia, Irène Gijbels, Stéphane Girard and Antoine Usseglio-Carleve. ------------------------------------------------ Il webinar è organizzato dalla "de Castro" Statistics Initiative www.carloalberto.org/stats 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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Seminar announcement
by Marco Scarsini 05 Apr '21

05 Apr '21

Thursday, 8 April, 17:00 CET *Clémentine Prieur**, *Université Grenoble Alpes Shapley Effects for Sensitivity Analysis with Correlated Inputs: Comparisons with Sobol' Indices, Numerical Estimation and Applications <http://mailsender.luiss.it/lists/lt.php?id=cRpQBgMLSAUEBAROVgFdBQs> Discussants: Baptiste Broto and Giovanni Rabitti The paper can be found here <https://hal.inria.fr/hal-01556303v7>. This is the link to the Virtual Room <http://mailsender.luiss.it/lists/lt.php?id=cRpQAAYBSAUEBAROVgFdBQs>. The schedule of the upcoming seminars can be found here <https://economiaefinanza.luiss.it/en/seminari/seminari-2021>. 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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Oggetto: Concorso RTD-B a Milano Bicocca - MAT/06
by Gianmario Tessitore - UNIMIB 03 Apr '21

03 Apr '21

----------------------------------------------------------------------------- Concorso per un posto RTD-B a Milano Bicocca - MAT/06 ----------------------------------------------------------------------------- È stato bandito un posto RTD-B nel settore MAT/06 (Probabilità e Statistica Matematica) presso il Dipartimento di Matematica e Applicazioni dell'Università di Milano-Bicocca Il bando si trova alla pagina https://www.unimib.it/ateneo/gare-e-concorsi/2021-rtdb-042 La scadenza per la presentazione delle domande è il 29 aprile 2021. Si prega di dare la massima diffusione presso tutti gli interessati. -- Gianmario Tessitore Dipartimento di Matematica e Applicazioni Università degli Studi di Milano-Bicocca

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Workshop "Bayesian Inference in Stochastic Processes - Online" 27-28 May 2021 - Call for contributions
by elisa varini 31 Mar '21

31 Mar '21

*CALL FOR CONTRIBUTIONS*** On behalf of the Scientific and Organising Committees we are pleased to inform you that contributions are now accepted for the Twelfth Workshop on “Bayesian Inference in Stochastic Processes (BISP12)” which will be held ONLINE on 27-28 May 2021 (afternoons, Central European Summer Time). Website:https://bisp.imati.cnr.it <https://bisp.imati.cnr.it> __ Attendance is free of charge but registration is required. As in the past, the workshop will provide the opportunity to review, discuss and explore directions of development of Bayesian inference in stochastic processes. The workshop has always offered many young researchers the opportunity to present their works in invited sessions. This year the entire invited programme is dedicated to them. Ten presentations by young scientists have been scheduled, followed by an in-depth discussion by senior scholars in the field. *We are now soliciting contributions for a virtual poster session. * We plan to post contributed videos on the workshop website and keep them there for a while after the event, with links to the presenting authors’ websites/emails, so that they can be contacted by interested people. Unfortunately, time constraints will not allow for the presentation of all those works during the workshop but we will allocate short spots for ten contributors to highlight the main findings of their research and few questions & answers. An abstract must be submitted *by 18 April* via the BISP12 website, where the abstract template (Word and Latex) and the guidelines for submission are provided. After submitting the abstract, contributors will receive an acceptance notification email by *30 April* and instructions to upload a pre-recorded video and/or a slide presentation by *15 May*. All presentations will be published on the BISP12 website. The workshop is organised by CNR-IMATI, Institute of Applied Mathematics and Information Technology at the National Research Council of Italy, Milano, www.imati.cnr.it <http://www.imati.cnr.it>. Elisa Varini and Fabrizio Ruggeri Chairs, Organising and Scientific Committees

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Workshop "Bayesian Inference in Stochastic Processes - Online" 27-28 May 2021 - Call for contributions
by elisa varini 30 Mar '21

30 Mar '21

*CALL FOR CONTRIBUTIONS* On behalf of the Scientific and Organising Committees we are pleased to inform you that contributions are now accepted for the Twelfth Workshop on “*Bayesian Inference in Stochastic Processes (BISP12)*” which will be held ONLINE on 27-28 May 2021 (afternoons, Central European Summer Time). _Websit__e_:bisp.imati.cnr.it__ Attendance is free of charge but registration is required. As in the past, the workshop will provide the opportunity to review, discuss and explore directions of development of Bayesian inference in stochastic processes. The workshop has always offered many young researchers the opportunity to present their works in invited sessions. This year the entire invited programme is dedicated to them. Ten presentations by young scientists have been scheduled, followed by an in-depth discussion by senior scholars in the field. *We are now soliciting contributions for a virtual poster session. * We plan to post contributed videos on the workshop website and keep them there for a while after the event, with links to the presenting authors’ websites/emails, so that they can be contacted by interested people. Unfortunately, time constraints will not allow for the presentation of all those works during the workshop but we will allocate short spots for ten contributors to highlight the main findings of their research and few questions & answers. An abstract must be submitted *by 18 April* via the BISP12 website, where the abstract template (Word and Latex) and the guidelines for submission are provided. After submitting the abstract, contributors will receive an acceptance notification email by *30 April* and instructions to upload a pre-recorded video and/or a slide presentation by *15 May*. All presentations will be published on the BISP12 website. The workshop is organised by CNR-IMATI, Institute of Applied Mathematics and Information Technology at the National Research Council of Italy, Milano, www.imati.cnr.it <http://www.imati.cnr.it>. Elisa Varini and Fabrizio Ruggeri Chairs, Organising and Scientific Committees

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Three open PhD positions in statistics at the University of Twente
by Gianluca Finocchio 30 Mar '21

30 Mar '21

Dear all, there are three open PhD positions in statistics at the University of Twente https://www.utwente.nl/en/organisation/careers/!/2021-297/three-phd-positio… Feel free to forward the link to potentially interested candidates. Application deadline is April 15. Best,Gianluca Finocchio

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