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Seminar in Statistics - ANGELIKA ROHDE
by Pierpaolo De Blasi 16 Jan '23

16 Jan '23

SEMINARS IN STATISTICS @ COLLEGIO CARLO ALBERTO <https://www.carloalberto.org/events/category/seminars/seminars-in-statistic…> Venerdi 20 Gennaio 2023, alle ore 12.00, presso il Collegio Carlo Alberto, in Piazza Arbarello 8, Torino, si terrà il seguente seminario: ------------------------------------------------ Speaker: *Angelika Rohde* (University of Freiburg) Title: *Estimating functionals under local differential privacy* Abstract: We study the problem of estimating a functional $\theta(\mathbb{P})$ of an unknown probability distribution $\mathbb{P} \in\mathcal{P}$ in which the original iid sample $X_1,\dots, X_n$ is kept private even from the statistician via an $\alpha$-local differential privacy constraint. Let $\omega_{TV}$ denote the modulus of continuity of the functional $\theta$ over $\mathcal{P}$ with respect to total variation distance. For a large class of loss functions $l$ and a fixed privacy level $\alpha$, we prove that the privatized minimax risk is equivalent to $l(\omega_{TV}(n^{-1/2}))$ to within constants, under regularity conditions that are satisfied, in particular, if $\theta$ is linear and $\mathcal{P}$ is convex. Our results complement the theory developed by Donoho and Liu (1991 Ann. Statist. 19 633–667) with the nowadays highly relevant case of privatized data. Somewhat surprisingly, the difficulty of the estimation problem in the private case is characterized by $\omega_{TV}$, whereas, it is characterized by the Hellinger modulus of continuity if the original data $X_1,\dots, X_n$ are available. We also find that for locally private estimation of linear functionals over a convex model a simple sample mean estimator, based on independently and binary privatized observations, always achieves the minimax rate. In particular, over the larger class of so-called sequentially interactive privacy mechanisms, a non-interactive procedure attains this rate. Next, we turn to one of the most studied non-linear functionals, the quadratic functional. Here, in contrast, we show that for estimating the integrated square of a density, sequentially interactive privacy mechanisms improve substantially over the best possible non-interactive procedure in terms of minimax rate of estimation. In particular, in the non-interactive scenario we identify an elbow in the minimax rate at $s=3/4$, whereas in the sequentially interactive scenario the elbow is at $s=1/2$. This is markedly different from both, the case of direct observations, where the elbow is well-known to be at $s=1/4$, as well as from the case where Laplace noise is added to the original data, where an elbow at $s=9/4$ is obtained. ------------------------------------------------ Sarà possibile seguire il seminario anche in streaming: Join Zoom Meeting <https://us02web.zoom.us/j/89240989650?pwd=eVZSTUVEWHM2SnhBWXpnL21VU3gvQT09> Il seminario è organizzato dalla "de Castro" Statistics Initiative www.carloalberto.org/stats -- Pierpaolo De Blasi University of Torino & Collegio Carlo Alberto carloalberto.org/pdeblasi <https://sites.google.com/a/carloalberto.org/pdeblasi/>

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Summer school: Deterministic and random features of fluids - EPFL, 2023.7.3-7
by Lucio Galeati 15 Jan '23

15 Jan '23

Dear colleagues, I'm glad to inform you about the following event that we are organizing at EPFL for this July; feel free to advertise it among potentially interested participants at your department. Below you can find a short description and the link to the official website. Participation is free but mandatory; there is (limited) funding for travel and accommodation, for which case the application deadline is March 15th 2023. All the best, Lucio (on behalf of the organising committee) ========= Summer school: Deterministic and random features of fluids Date: Monday, Jul 3, 2023 -- Friday, Jul 7, 2023 Place: EPFL, Lausanne, Switzerland The summer school focuses on the deterministic and random phenomenologies of incompressible fluids. The format consists of two lecture series (6 hours each) by Prof. Jacob Bedrossian and Prof. Thierry Gallay and of several research talks by experts in the field. The lectures address two main themes: chaotic properties of fluid models in the presence of an external random force and stability at high Reynolds number of vortex configurations. The school is intended to introduce early stage researchers (Ph.D. and postdocs) to these subjects. Support for selected young participants will be available. Organizing Commitee: M. Colombo, M. Dolce, L. Galeati, M. Sorella Website@EPFL: https://www.epfl.ch/labs/amcv/amcv/events/summer-school-deterministic-and-r…

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EXECUTIVE 2nd LEVEL MASTER in QUANTUM MACHINE LEARNING
by Marco Corazza 13 Jan '23

13 Jan '23

*EXECUTIVE 2nd LEVEL MASTER inQUANTUM MACHINE LEARNING* Dear All, I inform you that the deadline for the enrollment to the *EXECUTIVE 2nd LEVEL MASTER in QUANTUM MACHINE LEARNING* has been extended to February 1, 2023. For all details, see *https://www.cafoscarichallengeschool.it/en/master/quantum-machine-learning/ <https://www.cafoscarichallengeschool.it/en/master/quantum-machine-learning/>* . Please, I kindly ask you to give the widest circulation to this note. Looking forward to seeing you at our Master, Marco Corazza -- Marco Corazza, Ph.D. Department of Economics - Ca' Foscari University of Venice San Giobbe, Cannaregio 873 - 30121 Venezia, Italy Mobile: (+39) 366 602-9134 Phone: (+39) 041 234-6921 Fax: (+39) 041 234-7444 E-mail: corazza(a)unive.it Editor-in-Chief: Mathematical Methods in Economics and Finance - www.unive.it/m2ef -- <<Determinare [... gli] aspetti della struttura di una ConvNet rispecchia l'arte di far funzionare queste reti complesse per un particolare compito.>> M. Mitchell, "L'intelligenza artificiale. Una guida per esseri umani pensanti", Giulio Einaudi Editore, 2022 [pag. 69]

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Fwd: January 24-25 IRS 2023 Conference Program
by Faggionato, Alessandra 13 Jan '23

13 Jan '23

Buongiorno Inoltro l'annuncio di IRS 2023 con l'orario e titoli dei seminari delle 2 giornate Saluti Alessandra ---------- Forwarded message --------- From: Inhomegenous Random <inter(a)math.cnrs.fr> Date: Mon, 2 Jan 2023 at 16:38 Subject: January 24-25 IRS 2023 Conference Program To: <faggiona(a)mat.uniroma1.it> Dear Colleagues, Here is the program of the conference on: INHOMOGENEOUS RANDOM SYSTEMS Tuesday 24 and Wednesday 25 January 2023 Institut Curie Amphitheatre Curie and Institut Henri Poincare Amphitheatre Hermite 11-13 rue Pierre et Marie Curie, Paris also online Registration is important for organizational purposes: thank you for registering if you haven't done so yet, BEFORE TUESDAY, JANUARY 17, also to receive the connection link. Abstracts are available at: http://irs.math.cnrs.fr Looking forward to meeting you, in Paris or online, Giambattista Giacomin, Christian Maes, Ellen Saada. *You will find in attachment a PDF file of the program with the same informations as below which you may print and post up. -------------------------------------------------------------------- -------------------------------------------------------------------- INHOMOGENEOUS RANDOM SYSTEMS Systemes Aleatoires Inhomogenes January 24-25, 2023 Conference Program Institut Curie Amphitheatre Curie and Institut Henri Poincare Amphitheatre Hermite 11-13 rue Pierre et Marie Curie, Paris also online Tuesday 24 January: ------------------------------------------------------------------- POINT PROCESSES AND STATISTICAL MECHANICS ------------------------------------------------------------------- Moderator: Alessandra Faggionato (Roma) 9.00- 9.10 Opening 9.10-10.00 Alessandra Faggionato (Roma): Random resistor networks on simple point processes and Mott's law. 10.00-10.50 Martin Huesmann (Muenster): Fluctuations of the displacement in the optimal matching problem. 10.50-11.15 Coffee Break 11.15-12.05 Sabine Jansen (Muenchen): Large deviations and distribution of cracks in a chain of atoms at low temperature. 12.05-13.30 Lunch 13.30-13.55 Thierry Bodineau (Bures-sur-Yvette), Giambattista Giacomin (Paris), Dasha Loukianova (Evry): A tribute to Francis Comets 14.00-14.50 Frank den Hollander (Leiden): Metastability for the Widom-Rowlinson model with grains of general shape. 14.50-15.40 Raphael Lachieze-Rey (Paris): Percolation of random fields excursions. 15.40-16.05 Coffee Break 16.05-16.55 Giovanni Peccati (Luxembourg): Functional inequalities on the Poisson space, via stopping sets and two-scale stabilization. 16.55-17.45 Antoine Gloria (Paris & Bruxelles): On Einstein's effective viscosity formula. Wednesday 25 January: ------------------------------------------------------------------- FREE PROBABILITY, BETWEEN MATHS AND PHYSICS ------------------------------------------------------------------- Moderator: Jorge Kurchan (Paris) 9.00- 9.10 Opening 9.10- 9.30 Jorge Kurchan (Paris): Introduction. 9.30-10.20 Roland Speicher (Saarbruecken): Free probability and free cumulants. 10.20-10.45 Coffee Break 10.45-11.35 Frederic Patras (Nice): Algebraic structures underlying free probability. 11.35-12.25 Alice Guionnet (Lyon): Matrix models at low temperature. 12.25-13.45 Lunch 13.45-14.35 Denis Bernard (Paris): The Quantum SSEP and the emergence of free probability in many-body mesoscopic quantum systems. 14.35-15.25 Laura Foini (Saclay): Eigenstate Thermalization Hypothesis and Free Probability. 15.25-15.50 Coffee Break 15.50-16.40 Marc Potters (Paris): Free probabilities in action: the spectral method for phase retrieval. 16.40-17.30 Jean-Philippe Bouchaud (Paris): Covariance stability & eigenvector overlaps : a (free) RMT approach. ------------------------------------------------------------------- Registration: The conference and online participation are free and open to all. To facilitate local organisation and receive your connection link, please register in advance by sending an e-mail before January 17 to "inter(a)math.cnrs.fr" with subject: IRS 2023 and the following informations: Name: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Institution:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Address:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Email:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ on site or online:_ _ _ _ _ _ _ _ _ _ _ _ You may also consult the conference web page at: http://irs.math.cnrs.fr Giambattista Giacomin Christian Maes Mathematiques, LPSM Theoretische Fysica Universite Paris Cite KU Leuven, Belgium Ellen Saada Mathematiques, MAP5 CNRS & Universite Paris Cite Partially supported by CNRS, Universite Paris Cite and KU Leuven. ----------------------------------------------------------------- ----------------------------------------------------------------- -- ************************************************* Prof. Alessandra Faggionato https://www1.mat.uniroma1.it/people/faggionato/ Department of Mathematics University "La Sapienza" Piazzale Aldo Moro, 5 00185 - Rome Office 5, Phone (0039) 06 49913252 *************************************************

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Seminario Paolo Dai Pra
by Enrica Pirozzi 11 Jan '23

11 Jan '23

AVVISO di SEMINARIO Prof. Paolo Dai Pra Università di Verona TITOLO Polarization and Coherence in Mean Field Games Driven by Private and Social Utility Abstract We study a mean field game in continuous time over a finite horizon, T, where the state of each agent is binary and where players base their strategic decisions on two, possibly competing, factors: the willingness to align with the majority (conformism) and the aspiration of sticking with the own type (stubbornness). We also consider a quadratic cost related to the rate at which a change in the state happens: changing opinion may be a costly operation. Depending on the parameters of the model, the game may have more than one Nash equilibrium, even though the corresponding N- player game does not. Moreover, it exhibits a very rich phase diagram, where polarized/unpolarized, coherent/incoherent equilibria may coexist, except for T small, where the equilibrium is always unique. We fully describe such phase diagram in closed form and provide a detailed numerical analysis of the N-player counterpart of the mean field game. Joint work with Marco Tolotti (Venezia) and Elena Sartori (Padova). Il seminario si terrà il giorno 13 Gennaio 2023 ore 11:00 nella Aula F del Dipartimento Matematica e Applicazioni, Università di Napoli FEDERICO II, Complesso di Monte Sant'Angelo, Via Cintia, Napoli. Link a Teams: https://teams.microsoft.com/l/meetup-join/19%3aMQ4RZDBo_0G-K_PHxKtktVYAczOG… -- 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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PhD/Post-doc Researcher at private company - Mathematics/statistics
by Stefano Herzel 11 Jan '23

11 Jan '23

Research position in mathematics/statistics at a private company: - For PhD/Postdoc (Master's ok) in Mathematics or equivalent - No programming or finance prerequisites. For more information visit arpm.co/job/researcher <http://arpm.co/job/researcher>

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Postdoc positions at Bocconi (Milan)
by Giacomo Zanella 11 Jan '23

11 Jan '23

Three postdoc positions available at Bocconi University (Milan, Italy), under the supervision of Giacomo Zanella (link <https://sites.google.com/site/gzanellawebpage/home>) and funded by the ERC Starting Grant "Provable Scalability for high-dimensional Bayesian Learning". Details and links to apply available at https://sites.google.com/site/gzanellawebpage/postdoc-positions-available. The deadline for application is 28/02/2023 and the planned starting date is 01/05/2023 (with some flexibility). Initial contracts are for 1 year and are extendable for further years under mutual agreement. Candidates will conduct research on computational aspects of statistical and machine learning methods, with a particular focus on Bayesian methodologies. The research activity, both in terms of specific topic and research approach, can adapt to the profile and interests of the successful candidates. Beyond working with the supervisor and coauthors on topics related to the grant project (see https://sites.google.com/site/gzanellawebpage/research and https://cordis.europa.eu/project/id/101076564 for more details on the research topics of the supervisor and grant project), candidates will get the chance to interact with various faculty members, postdocs and PhD students of the Stats&ML group at Bocconi (see e.g. researchers at https://bayeslab.unibocconi.eu/people and https://dec.unibocconi.eu/people ). Interested candidates can write to giacomo.zanella(a)unibocconi.it for more information about the positions. Best regards, Giacomo Zanella

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Summer School on "Statistical Mechanics and Stochastic PDEs" (Sep 11-15, 2023)
by Francesco Caravenna 11 Jan '23

11 Jan '23

Dear friends, We would like to advertise a summer school entitled "Statistical Mechanics and Stochastic PDEs", which will be held from Sep 11-15, 2023, in Cetraro, Italy. It belongs to the series of mathematics summer schools organised yearly by Fondazione CIME. The school aims to expose researchers to some of the latest developments in statistical mechanics and stochastic PDEs, as well as the connections between the two. The list of speakers and their course titles is: Massimiliano Gubinelli (Univ. Oxford, UK) - Constructive stochastic quantization Antti Kupiainen (Univ. Helsinki, Finland) - Renormalisation Group and stochastic PDEs Ioan Manolescu (Univ. Fribourg, Switzerland) - An invitation to FK percolation Fabio Lucio Toninelli (Technical Univ. Vienna, Austria) - Stochastic growth models and anisotropic KPZ equation in dimension 2+1 We especially encourage the participation of PhD students and postdocs. A limited number of grants will be available to cover their local expenses (full board accommodation). Interested participants should submit their applications before Apr 30, 2023, through the school website: https://sites.google.com/unifi.it/cime/c-i-m-e-courses/c-i-m-e-courses-2023… <https://sites.google.com/unifi.it/cime/c-i-m-e-courses/c-i-m-e-courses-2023…> Some practical details on the location: https://sites.google.com/unifi.it/cime/c-i-m-e-courses/c-i-m-e-courses-2022… <https://sites.google.com/unifi.it/cime/c-i-m-e-courses/c-i-m-e-courses-2022…> Please feel free to circulate the information. The organisers, Francesco Caravenna, Rongfeng Sun, Nikos Zygouras

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Annuncio Seminario Sapienza // Martedì 10 Gennaio // Lorenzo Dello Schiavo
by Lorenzo Taggi 09 Jan '23

09 Jan '23

Martedì 10 Gennaio 2023, ore 14:00 Sala di Consiglio, Dipartimento di Matematica, Sapienza Università di Roma *Speaker: *Lorenzo Dello Schiavo (ISTA, Vienna) *Titolo:* Scaling Limits of Random Walks, Harmonic Profiles, and Stationary Non-Equilibrium States in Lipschitz Domains *Abstract:* We consider the open symmetric exclusion (SEP) and inclusion (SIP) processes on a bounded Lipschitz domain Ω, with both fast and slow boundary. For the random walks on Ω dual to SEP/SIP we establish a functional-CLT-type convergence to the Brownian motion on Ω with either Neumann (slow boundary), Dirichlet (fast boundary), or Robin (at criticality) boundary conditions. We further show the discrete-to-continuum convergence of the corresponding harmonic profiles. As a consequence, we rigorously derive the hydrodynamic and hydrostatic limits for SEP/SIP on Ω, and analyze their stationary non-equilibrium fluctuations. Based on joint work arXiv:2112.14196 with Lorenzo Portinale (IAM Bonn) and Federico Sau (ISTA)

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Workshop on Quantitative Finance 2023
by Marina DI GIACINTO 08 Jan '23

08 Jan '23

-------------------------------------- Apologies for cross-postings -------------------------------------- Dear Colleagues, This is a gentle reminder on the call for papers of the XXIV Workshop on Quantitative Finance (QFW2023), which will be held at the Angevin Castle in Gaeta (Italy) on April 20th-22nd, 2023. The deadline for submitting extended abstracts is next Sunday, January 15th, 2023. The call for papers is attached, and the poster of the conference can be downloaded here <https://drive.google.com/file/d/1aoSPNCgHk4caf_LOB4Vk61XDCmvdJG1m/view>. Attendance is free of charge, but registration is required for organizational reasons. Further information is available on the conference website https://qfw2023.unicas.it/. We are looking forward to meeting you in Gaeta! Marina Di Giacinto On behalf of the Organizing Committee

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