- Random - Mailing list — Dipartimento di Matematica, UniPI

Pisa à la carte -- random trees & planar maps -- January 29th-30th
by Alessandra Caraceni 13 Dec '23

13 Dec '23

Dear colleagues, it is my pleasure to announce a two-day workshop at the Scuola Normale of Pisa, taking place on Monday the 29th and Tuesday the 30th of January, 2024, around themes of random planar maps, random trees, random graphs. Registration is free; it is open starting now and until January 15th at the link: https://forms.gle/HYyjJ1NQDYoCfrMb6 You can look forward to talks by the following speakers: Louigi Addario-Berry, McGill University Marie Albenque, IRIF Université Paris Cité Eleanor Archer, Université Paris Nanterre Thomas Budzinski, ENS Lyon Guillaume Chapuy, IRIF Université Paris Cité Nicolas Curien, Université Paris-Saclay Christina Goldschmidt, University of Oxford Jean-François Le Gall, Université Paris-Saclay Robin Stephenson, University of Sheffield Keep up to date with information about the programme by checking the website: https://sites.google.com/sns.it/pisaalacarte/home Hoping to welcome as many of you as possible! Please do not hesitate to share this announcement with whoever you think might be interested. All the best, Alessandra Caraceni Scuola Normale Superiore

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Bando con scadenza corretta
by epirozzi 12 Dec '23

12 Dec '23

Correzione: scadenza 31 gennaio 2024 Si segnala il seguente bando per assegno di Ricerca presso il Dipartimento di Matematica e Applicazioni dell'Università di Napoli FEDERICO II con scadenza il 31 gennaio 2024 http://www.unina.it/documents/11958/48570136/DMA_AR-13_2023-12-11_bando.pdf Cari saluti Enrica -- Enrica Pirozzi Professore Associato di Probabilità e Statistica, Dipartimento di Matematica e Applicazioni, Università di Napoli FEDERICO II Via Cintia, 80126, NAPOLI https://www.docenti.unina.it/enrica.pirozzi

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12th World Congress of the Bachelier Finance Society
by Beatrice Acciaio 12 Dec '23

12 Dec '23

> 12th World Congress of the Bachelier Finance Society > > <https://bachelierfinance.us18.list-manage.com/track/click?u=702156a1168de89…> > > > Getulio Vargas Foundation FGV EMAp, > Rio de Janeiro, July 8-12, 2024 > > > Call for Papers > > Every two years, the *World Congress* of the *Bachelier Finance > Society* brings together academics and practitioners in the > Mathematical and Quantitative Finance community to exchange ideas on > the state-of-the-art, discuss the latest trends in the field, and find > new collaborations and employment opportunities. > > The 12th World Congress of the Bachelier Finance Society > <https://bachelierfinance.us18.list-manage.com/track/click?u=702156a1168de89…> will > take place at *FGV EMAp, Rio de Janeiro, July 8-12, 2024*. > > > Louis Bachelier Lecture > > Michael Ludkovski (University of California, Santa Barbara, USA). > > > Plenary Speakers > > Francesca Biagini (University of Munich, Germany), Agostino Capponi > (Columbia University, USA), Christa Cuchiero (University of Vienna, > Austria), Min Dai (The Hong Kong Polytechnic University, China), > Pierre Henry-Labordère (Qube Research and Technologies), Johannes > Muhle-Karbe (Imperial College London, UK), Emanuela Rosazza Gianin > (Università degli Studi di Milano-Bicocca, Italy), Peter Tankov > (ENSAE, France). > > > Scientific Committee > > Beatrice Acciaio (ETH Zurich, Switzerland), Hans Buehler (XTX Markets, > UK), Giorgia Callegaro (Università degli Studi di Padova, Italy), Nan > Chen (Chinese University of Hong Kong, China), Giulia Di Nunno > (University of Oslo, Norway), Jean-Pierre Fouque (University of > California, Santa Barbara, USA), Emmanuel Gobet (École Polytechnique, > France), Sebastian Jaimungal (University of Toronto, Canada), Steven > Kou (Boston University, USA), Ernesto Mordecki (Universidad de la > República, Uruguay), Christoph Reisinger (University of Oxford, UK), > Yuri Saporito (Getulio Vargas Foundation, Brazil), Nizar Touzi (École > Polytechnique, France), Thaleia Zariphopoulou (University of Texas at > Austin, USA), Jorge Zubelli (Khalifa University, UAE). > > > Submissions are open now > > Submissions are open on the conference website > <https://bachelierfinance.us18.list-manage.com/track/click?u=702156a1168de89…> through > *January 29, 2024*. > > > Registrations are open now > > Registrations are open on the conference website > <https://bachelierfinance.us18.list-manage.com/track/click?u=702156a1168de89…> (Early > Bird until *April 30, 2024)*. > > > Poster > > The poster of the Congress can be found here > <https://bachelierfinance.us18.list-manage.com/track/click?u=702156a1168de89…>. >

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Padova Seminars in Probability and Finance - Martin Slowik
by Alberto Chiarini 11 Dec '23

11 Dec '23

Dear all, We would like to invite you to a seminar talk by Martin Slowik (University of Mannheim) for the "Padova Seminars in Probability and Finance" that will take place on Friday 15th December at 15:30, streamed via Zoom in room 2BC30, in Torre Archimede. Title: Metastability of Glauber dynamics with inhomogeneous coupling disorder Date: December 15, 2023 at 15:30, streamed via Zoom in room 2BC30 Zoom: https://unipd.zoom.us/j/85838041170?pwd=SitoTTBtcjkxeTBpNGpsMkpteHc3Zz09 Meeting ID: 858 3804 1170 Passcode: 115159 Abstract: Metastability is a phenomenon that occurs in the dynamics of a multi-stable non-linear system subject to noise. It is characterised by the existence of multiple, well separated time scales. The talk will be focused on the metastable behaviour of a general class of mean-field-like spin systems with random couplings that evolve according to a Glauber dynamics at fixed temperature. This class of systems comprises both the Ising model on inhomogeneous dense random graphs and the randomly diluted Hopfield model. Assuming that the corresponding system in which the random couplings are replaced by their averages is metastable I will explain how the metastability of the random system is implied with high probability. In particular, I will discuss the tail behaviour of the relevant metastable hitting times of the two systems and the moments of their ratio. This is joint work with A. Bovier, F. Den Hollander, S. Marello and E. Pulvirenti. Hope to see many of you! Best wishes, Alberto Chiarini e Alekos Cecchin

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Seminar in Statistics - ISMAEL CASTILLO
by Pierpaolo De Blasi 11 Dec '23

11 Dec '23

SEMINARS IN STATISTICS @ COLLEGIO CARLO ALBERTO <https://www.carloalberto.org/events/category/seminars/seminars-in-statistic…> Venerdi 15 Dicembre 2023, alle ore 12.00, presso il Collegio Carlo Alberto, in Piazza Arbarello 8, Torino, si terrà il seguente seminario: ------------------------------------------------ Speaker: Ismael Castillo (Sorbonne Université, Paris, France) Title: *Bayesian nonparametric adaptation with heavy-tailed priors* Abstract: We propose a new strategy for adaptation based on heavy-tailed priors. We illustrate it in a variety of settings, showing in particular adaptation with respect to unknown smoothness and structure parameters in the minimax sense (up to logarithmic factors). We present numerical simulations corroborating the theory. This talk is based on joint works with Sergios Agapiou (Cyprus) and with Paul Egels (Sorbonne, in progress). ------------------------------------------------ Sarà possibile seguire il seminario anche in streaming: Join Zoom Meeting <https://us02web.zoom.us/j/81877065471?pwd=SnBhTkNWRlA5cy9XZjdldFJpUzJkdz09> 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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Research associate position in Pisa
by Marco Romito 11 Dec '23

11 Dec '23

Dear colleagues I would like to advertise a 12 months Research Associate position (assegno di ricerca in the Italian jargon), funded by the PRIN 2022 project /Noise in fluid dynamics and related models/, at the Math Department of the University of Pisa. The details of the call are available here: https://bandi.unipi.it/public/Bandi/Detail/b7e8abb4-b801-4b20-bfb5-da6ad780… The deadline is on January 4, 2024, at 1pm CET. Please feel free to reach out to me for any further information. Best regards M. Romito

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SPASS Seminar: Massimiliano Datres
by Andrea Agazzi 10 Dec '23

10 Dec '23

Dear Colleagues, We would like to invite you to the following SPASS seminar, jointly organized by UniPi, SNS, UniFi and UniSi: *A two-scale complexity measure for stochastic neural networks * by Massimiliano Datres (Università di Trento) The seminar will take place on TUE, 12.12.2023 at 14:00 CET in Aula Seminari, Dipartimento di Matematica, UNIPI and streamed online at the link below. The organizers, A. Agazzi, G. Bet, A. Caraceni, F. Grotto, G. Zanco https://sites.google.com/unipi.it/spass -------------------------------------------- *Abstract: **Over-parametrized deep learning models are achieving outstanding performances in solving several complex tasks such as image classification problems, object detection and natural language processing. Despite the risk of overfitting, these parametric models show impressive generalization after training. Hence, defining appropriate complexity measures becomes crucial for understanding and quantifying the generalization capabilities of deep learning models. In this talk, I will introduce a new notion of complexity measure, called two-scale effective dimension (2sED), which is a box-covering dimension related to a metric induced by the Fisher information matrix of the parametric model. I will then show how the 2sED can be used to derive a generalization bound. Furthermore, I present an approximation of the 2sED for Markovian models, called lower 2sED, that can be computed sequentially layer-by-layer with less computational demands. Finally, I present experimental evidence that the post-training performance of given parametric models is related both with 2sED and the lower 2sED.*

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Avviso seminario
by Franco Flandoli 10 Dec '23

10 Dec '23

Mercoledì 13 dicembre 2023, h. 14:30-15:30 Scuola Normale Superiore, Pisa, Aula Tonelli *Alessandra Lanotte (CNR-Nanotech Lecce)* terrà un seminario dal titolo: *"Turbulent regime investigation in quantum fluids of light"* *Abstract: *The observation of turbulent regimes in quantum fluids is receiving renewed interest thanks to the ability to manipulate with a high degree of control quantum systems such as superfluid helium or atomic Bose–Einstein condensates. We discuss the turbulent dynamics of a two-dimensional quantum fluid of exciton–polaritons, hybrid light–matter quasiparticles, both by measuring the kinetic energy spectrum and showing the onset of vortex clustering. These results contribute to the investigations of quantum turbulence in two-dimensional fluids, a relatively young research field. Classe di Scienze

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One world probability seminar on Thursday 14 December
by Ilya Chevyrev 08 Dec '23

08 Dec '23

Dear all, The next session of the One World Probability Seminar will be next week on Thursday (December 14) from 14:00 to 16:00 *UTC time*.The speakers of this session are Marcel Nutz (Columbia University) and Stephan Eckstein (ETH Zürich). Title, abstract and the zoom link are below the signature and can be also found on the website https://www.owprobability.org/one-world-probability-seminar. Kind regards, Julio Backhoff and Ilya Chevyrev. Title: Entropic Selection in Optimal Transport Abstract:The optimal transport problem can admit many solutions, for instance when the cost function is the Euclidean distance on R^d (Monge's problem). On the other hand, entropically regularized optimal transport (EOT) always has a unique optimizer. It is a longstanding open problem whether EOT selects some particular optimal transport coupling in the vanishing regularization limit, and what that coupling would look like. We provide a surprising answer for Monge's problem in dimension d > 1. (Joint work with Chenyang Zhong.) Speaker 1 (14:00-15:00 UTC): Marcel Nutz (Columbia University). Title: Exponential convergence of Sinkhorn's algorithm and Hilbert's projective metric for unbounded functions Abstract: Entropic regularization of optimal transport has found numerous applications in various fields recently. A major reason for this surge in applications is the popularization of Sinkhorn's algorithm to efficiently solve the entropic optimal transport problem numerically. This talk studies the (rate of) convergence of Sinkhorn's algorithm. In bounded settings, it is known that Sinkhorn's algorithm converges with exponential rate, which is a consequence of applying a commonly used version of Hilbert's metric corresponding to the cone of all non-negative functions. This talk shows how to define versions of Hilbert's metric so that we can show exponential convergence of Sinkhorn's algorithm even in unbounded settings. This is done through the use of cones which are relaxations of the cone of all non-negative functions, in the sense that they include all functions having non-negative integral values when multiplied with certain test functions. Along the way, we establish that kernel integral operators are contractions with respect to suitable versions of Hilbert’s metric, even if the kernel functions are not bounded away from zero. Speaker 2 (15:00-16:00 UTC): Stephan Eckstein (ETH Zürich). Zoom-link: https://univienna.zoom.us/j/69978648939?pwd=WllwSmd4bW9EQlZJNlRqdlA3M0I1Zz09 Meeting ID: 699 7864 8939 Passcode: 713222

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Fwd: Postdoc position in Prague
by Marco Formentin 07 Dec '23

07 Dec '23

Ricevo e inoltro volentieri questo annuncio di due posizioni postdoc a Praga. Buona giornata, Marco Formentin

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