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Pisa Online Seminars - Michael Högele and Alessandra Caraceni (Tuesday, May 11 at 16:00 and 17:00)
by Giacomo Filippo Di Gesu 06 May '21

06 May '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<https://teams.microsoft.com/l/meetup-join/19:af3d635091e049579e555a84219ab3…"Tid":"c7456b31-a220-47f5-be52-473828670aa1","Oid":"dfd1e5f6-331d-43e0-a180-4bb6ce727fb7"}> Best regards, Giacomo Tuesday, May 11, 16:00 Speaker: Michael Högele (Universidad de los Andes) Title: Cutoff thermalization for Ornstein-Uhlenbeck systems with small Lévy noise in the Wasserstein distance Abstract: This talk presents recent results on cutoff thermalization (also known as the cutoff phenomenon) for a general class of asymptotically exponentially stable Ornstein-Uhlenbeck systems under ε-small additive Lévy noise. The driving noise processes include Brownian motion, α-stable Lévy flights, finite intensity compound Poisson processes and red noises and may be highly degenerate. Window cutoff thermalization is shown under generic mild assumptions, that is, we see an asymptotically sharp ∞/0-collapse of the renormalized Wasserstein distance from the current state to the equilibrium measure μ^ε along a time window centered in a precise ε-dependent time scale t_ε . In many interesting situations such as reversible (Lévy) diffusions it is possible to prove the existence of an explicit, universal, deterministic cutoff thermalization profile. The existence of this limit is characterized by the absence of non-normal growth patterns in terms of an orthogonality condition on a computable family of generalized eigenvectors of the matrix Q. With this piece of theory at hand this article provides a complete discussion of the cutoff phenomenon for the classical linear oscillator with friction subject to ε-small Brownian motion or α-stable Lévy flights. Furthermore, we cover the highly degenerate case of a linear chain of oscillators in a generalized heat bath at low temperature. Tuesday, May 11, 17:00 Speaker: Alessandra Caraceni (University of Oxford) Title: Polynomial mixing time for edge flips on planar maps Abstract: A long-standing problem proposed by David Aldous consists in giving a sharp upper bound for the mixing time of the so-called “triangulation walk”, a Markov chain defined on the set of all possible triangulations of the regular n-gon. A single step of the chain consists in performing a random edge flip, i.e. in choosing an (internal) edge of the triangulation uniformly at random and, with probability 1/2, replacing it with the other diagonal of the quadrilateral formed by the two triangles adjacent to the edge in question (with probability 1/2, the triangulation is left unchanged). While it has been shown that the relaxation time for the triangulation walk is polynomial in n and bounded below by a multiple of n^{3/2}, the conjectured sharpness of the lower bound remains firmly out of reach in spite of the apparent simplicity of the chain. For edge flip chains on different models – such as planar maps, quadrangulations of the sphere, lattice triangulations and other geometric graphs – even less is known. We shall discuss results concerning the mixing time of random edge flips on rooted quadrangulations of the sphere obtained in joint work with Alexandre Stauffer. A “growth scheme” for quadrangulations, which generates a uniform quadrangulation of the sphere by adding faces one at a time at appropriate random locations, can be combined with careful combinatorial constructions to build probabilistic canonical paths in a relatively novel way. This method has implications for a range of interesting edge-manipulating Markov chains on so-called Catalan structures, from “leaf translations” on plane trees to “edge rotations” on general planar maps. ************************ 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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bando per RTDB in SECS-S/06 a Pavia
by benedetta.ferrario 05 May '21

05 May '21

Presso il Dipartimento di Scienze Economiche e Aziendali dell'Università di Pavia è stato bandito un posto RTD-B nel settore SECS-S/06, consultabile al link http://wcm-3.unipv.it/site/home/ateneo/bandi-e-concorsi/concorsi-per-person… Scadenza presentazione domande: 3 giugno 2021 ore 12.00. Si prega di dare la massima diffusione presso tutti gli interessati.

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Seminar Aernout van Enter
by Massimo Campanino 05 May '21

05 May '21

Aernout van Enter ONE-SIDED VERSUS TWO-SIDED STOCHASTIC PROCESSES Thursday the 6th of May 3 pm (Italian time) Stochastic processes can be parametrised by time (such as occurs in Markov chains), in which case conditioning is one-sided (on the past) or by one-dimensional space (which is the case, for example, for one-dimensional Markov fields), where conditioning is two-sided (on the right and on the left). I will discuss some examples, in particular generalising this distinction to g-measures versus Gibbs measures, where, instead of a Markovian dependence, the weaker property of continuity (in the product topology) is considered. In particular I will discuss when the two descriptions (one-sided or two-sided) produce the same objects and when they are different. We show moreover the role one-dimensional entropic repulsion plays in this setting. Based on joint work with R. Bissacot, E. Endo and A. Le Ny, and S. Shlosman ________________________________ Zoom link https://unibo.zoom.us/s/98736182682?zak=eyJ6bV9za20iOiJ6bV9vMm0iLCJhbGciOiJ… Join our Cloud HD Video Meeting<https://unibo.zoom.us/s/98736182682?zak=eyJ6bV9za20iOiJ6bV9vMm0iLCJhbGciOiJ…> Zoom is the leader in modern enterprise video communications, with an easy, reliable cloud platform for video and audio conferencing, chat, and webinars across mobile, desktop, and room systems. Zoom Rooms is the original software-based conference room solution used around the world in board, conference, huddle, and training rooms, as well as executive offices and classrooms. Founded in 2011, Zoom helps businesses and organizations bring their teams together in a frictionless environment to get more done. Zoom is a publicly traded company headquartered in San Jose, CA. unibo.zoom.us

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"SPDEs & friends" May 30, June 1-2
by Luisa Andreis 05 May '21

05 May '21

Dear colleagues, I forward this workshop announcement I’ve just received. Best regards, Luisa Andreis %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Dear all, We are organizing an online workshop on SPDEs which will take place from May 31st-June 2nd and feature many prominent speakers (Sandra Cerrai, Dan Crisan, Nina Holden, Nicolai Krylov, Jonathan Mattingly, Nicolas Perkowski, Jeremy Quastel, etc). http://page.math.tu-berlin.de/~tapia/spdes/ <https://l.facebook.com/l.php?u=http%3A%2F%2Fpage.math.tu-berlin.de%2F~tapia…> The basic plan is to have six 35-minute talks by different speakers per day, and each talk will be followed by a 15-minute discussion session. The participation is open to everyone, but for organizational purposes we would like to ask people who are interested in attending the workshop to complete the registration form https://forms.gle/G9Xw942iVNNgB4SLA <https://forms.gle/G9Xw942iVNNgB4SLA?fbclid=IwAR3iCpxoI2ACqgqUoSBjxpFsA8_2R1…> Please feel free to forward this email to interested friends, students, collaborators, and colleagues of yours! We are looking forward to seeing you at the event. Best regards, The organizers Oleg Butkovsky Peter Friz Nikolas Tapia

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Fwd: [owps] OWPS: talks tomorrow
by Faggionato, Alessandra 05 May '21

05 May '21

Buongiorno giro l'annuncio del OWPS di domani. Saluti Alessandra ---------- Forwarded message --------- Da: One World Probability <ow.probability(a)gmail.com> Date: mer 5 mag 2021 alle ore 08:12 Subject: [owps] OWPS: talks tomorrow To: <owps(a)lists.bath.ac.uk> Dear All, we have two talks tomorrow. Remember that we start 14:00 UTC which is 16:00 CET! 14:00-15:00 UTC Christina Goldschmidt The stable graph: the scaling limit of critical random graphs with i.i.d. random degrees having power-law tails Abstract: Consider a graph with label set \{1,2, \ldots,n\} chosen uniformly at random from those such that vertex i has degree D_i, where D_1, D_2, \ldots, D_n are i.i.d. strictly positive random variables. The condition for criticality (i.e. the threshold for the emergence of a giant component) in this setting is E[D^2] = 2 E[D], and we assume additionally that P(D = k) \sim c k^{-(\alpha + 2)} as k tends to infinity, for some \alpha \in (1,2). In this situation, it turns out that the largest components have sizes on the order of n^{\alpha/(\alpha+1)}. Building on earlier work of Adrien Joseph, we show that the components have scaling limits which can be related to a forest of stable trees (à la Duquesne-Le Gall-Le Jan) via an absolute continuity relation. This gives a natural generalisation of the scaling limit for the Erd\H{o}s-Renyi random graph (obtained in collaboration with Louigi Addario-Berry and Nicolas Broutin a few years ago, extending results of Aldous), which we call the stable graph. This complements recent work on random graph scaling limits by various authors including Bhamidi, Broutin, Duquesne, van der Hofstad, van Leeuwaarden, Riordan, Sen, M. Wang and X. Wang. 15:00 - 16:00 UTC Bénédicte Haas Distributional properties of the stable graphs Abstract: In this talk we will investigate some distributional properties of the connected components of the stable graphs introduced by Christina in the previous talk. We recall that for $\alpha \in (1,2]$, the $\alpha$-stable graph arises as the universal scaling limit of critical random graphs with i.i.d. degrees having an $\alpha$-dependent power-law tail behavior. Consider a connected component of such a graph. Our aim will be: (1) to describe the distribution of its kernel and more generally of its discrete finite-dimensional marginals, (2) to explicit its distribution as a collection of $\alpha$-stable trees glued on the kernel, and (3) present a line-breaking construction, in the same spirit as Aldous’ line-breaking construction of the Brownian CRT. Based on a joint work with Christina Goldschmidt and Delphin Sénizergues. The Zoom link is on the OWPS webpage. It can also be accessed directly via Zoom-link: https://tum-conf.zoom.us/j/68722718449 <https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftum-conf.…> Meeting ID: 687 2271 8449 Passcode: 054920 We hope to see you tomorrow! Best wishes, Julien and Nina -- ************************************************* 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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International Conference in Venice - CALL FOR PAPERS
by Monica Billio 04 May '21

04 May '21

20th INTERNATIONAL CONFERENCE CREDIT 2021 *Compound Risk: Climate, Disaster, Finance, Pandemic * Venice, Italy 23 –24 September 2021 * * *GRETA Associati* (Venice, Italy), *Cattolica Assicurazioni* (Verona, Italy), *European Datawarehouse *(Frankfurt, Germany), *European Investment Bank* (Luxembourg), *European Investment Fund *(Luxembourg) and *Intesa Sanpaolo *(Milan, Italy) are co-sponsors of a Conference to be held in Venice on September 23-24, 2021. The Conference CREDIT 2021 will bring together academics, practitioners and PhD students working in various areas of financial and credit risk with the aim to create a unique opportunity for participants to discuss research progress and policy and industry-relevant insights as well as directions for future research. Credit 2021 is the *twentieth *in a series of events dedicated to various aspects of credit risk and organised under the auspices of the *Department of Economics* and *VERA - Venice centre in Economic and Risk Analytics for public policies - of the Ca’ Foscari University of Venice*, *ABI - Italian Banking Association*,***AIAF - Associazione Italiana per l'Analisi Finanziaria* and the *Joint Research Center, European Commission* (Ispra, Italy). The theme of this year’s conference is the relation between financial risk on the one hand and pandemic, climate and disaster risk, on the other hand, with particular attention to the possible compounding of different sources of risk. The past year, 2020, has been marked by the still-ongoing COVID-19 pandemic crisis, which has shown how fragile our economic systems can be when confronted with shocks that threaten public health and the closeness of the connections between economic and financial risks and public policy. Climate change is now widely recognized as a new source of financial risk which is relevant both at the level of households and individual institutions and the systemic level. In particular, the many central banks and financial institutions that have joined the Network for Greening the Financial System (NGFS) have issued recommendations on how to integrate climate considerations into risk management strategies and practices. However, risks such as pandemics and climate change do not occur in isolation but can also compound, as has already been seen in several countries. The compounding of risk, which is currently poorly understood, increases the complexity of risk assessment and risk management, and it has implications for socio-economic development, as well as for public debt sustainability. In the EU, these aspects have major implications for efforts to increase the resilience of the economy to future shocks and to “build back better”, and requires the alignment of COVID-19 recovery policies, such as those supported by the NextGenerationEU, and the EU Green Deal and the Paris Agreement targets. The organizers of CREDIT 2021 encourage submissions on a range of topics of relevance to this year’s theme including: finance and COVID-19; finance and climate risks; finance and compound COVID-19 and climate risks. In particular, submissions are welcome in the following areas: • INVESTMENTS: Sustainable Finance, Disaster risk finance; Finance 4 good; public finance; blended finance. • POLICIES: Climate Policies, European Green New Deal; Next Generation EU; Recovery Plan. • INFORMATION: Data gaps; modelling challenges; risk transmission channels; uncertainty; complexity. The final program will include both submitted and invited papers. Acceptances received so far from invited speakers include *Vittoria Colizza *(INSERM, France), *Robert Engle *(Stern Business School, New York University) and *Roberto Rigobon* (MIT Sloan School of Management) who will deliver keynotes, respectively on finance and on epidemics. The Conference will also feature panel discussions on researchers', practitioners' and policy makers’ views of the major issues at stake. The SCIENTIFIC COMMITTEE for the Conference consists of: • * Stefano Battiston *(Ca’ Foscari University of Venice & University of Zurich, Programme Chair) • * Monica Billio *(Ca’ Foscari University of Venice & GRETA) • * Francesca Campolongo *(Joint Research Center, European Commission) • *Vittoria Colizza* (INSERM, France) • * Helmut Kraemer-Eis* (European Investment Fund) • * Jan Pieter Krahnen* (Leibniz Institute for Financial Research SAFE & Goethe University, Frankfurt) • *Irene Monasterolo *(Vienna University of Economics and Business) • *Steven Ongena* (University of Zurich, Swiss Finance Institute, KU Leuven & CEPR) • *Roberto Rigobon* (MIT Sloan School of Management) • *Stephen Schaefer* (London Business School) CALL FOR PAPERS Those wishing to present a paper at the Conference should submit by *May 31, 2021 *to the address given below (preferably in electronic format). Please indicate to whom correspondence should be addressed. Decisions regarding acceptance will be made by *June 30, 2021*. The final version of accepted papers must be received by August 31, 2021. Please send papers to: GRETA Associati, San Polo, 2605 - 30125 Venice, ITALY Phone : +39 041 5238178 - e-mail: credit(a)greta.it <mailto:credit@greta.it> More detailed information available on the Conference website: https://www.greta.it/index.php/it/credit-2021 <https://www.greta.it/index.php/it/credit-2021>

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Open PhD position in Mathematics at Vrije Universiteit Amsterdam
by Alessandro Zocca 04 May '21

04 May '21

Dear colleagues, There is an open fully-funded 4-year PhD position under my supervision at the Department of Mathematics of Vrije Universiteit Amsterdam. The PhD project will focus on learning and stochastic optimization for power networks, which are increasingly affected by uncertainty due to a quickly growing adoption of renewable energy sources. The project aims at using and expanding mathematical knowledge to better understand and optimize these complex networks, especially in combination with the large amount of newly-available data. The PhD candidate will use modern methods in (stochastic) optimization, applied probability, operations research, and learning theory to develop both new theory and algorithms. The preferred starting date is September 1, 2021. The candidates are expected to have a Master's degree in Mathematics or Operations Research, and a solid background in stochastics and optimization. For more information (including eligibility criteria, salary, and employment conditions) see https://workingat.vu.nl/ad/phd-position-on-learning-and-stochastic-optimiza…. Please apply online at the same link, the deadline is June 1, 2021, but early applications are encouraged. If you have any further questions regarding this vacancy, feel free to reach out to me by email at a.zocca(a)vu.nl. Please feel free to advertise this position further and bring it to the attention of potentially interested candidates. Thank you in advance. Best wishes, Alessandro ================================= Alessandro Zocca (he/his) Assistant Professor Vrije Universiteit Amsterdam Department of Mathematics https://sites.google.com/site/zoccaale/

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(PMS)^2 online talk: Guangqu Zheng, Monday May 10 at 17:30
by Maurizia Rossi 03 May '21

03 May '21

Dear colleagues, We are happy to announce the following online talk: Speaker: *Guangqu Zheng* (University of Kansas) Title: *Malliavin derivatives of hyperbolic Anderson model with applications to its absolute continuity and spatial averages.* Date and time: *Monday May 10, 17:30-18:30 (Rome time zone)* Abstract: see below. Zoom link: https://us02web.zoom.us/j/83843864962?pwd=NlNadHhIRkdzYUErZWJpbTNJaytDUT09 Meeting ID: 838 4386 4962 Passcode: 5gVVXb This talk is the second of the *(PMS)^2: Pavia-Milano Seminar series on Probability and Mathematical Statistics* organized jointly by the universities Milano-Bicocca, Pavia, Milano-Politecnico and Milano-Statale. Participation is free and welcome! (though limited to 100 participants for technical reasons) Best regards The organizers (Mario Maurelli, Carlo Orrieri, Maurizia Rossi, Margherita Zanella) *Abstract:* In this talk, we present recent work on the hyperbolic Anderson model driven by a space-time colored Gaussian homogeneous noise with spatial dimension one and two. Under mild assumptions, we provide Lp-estimates of the iterated Malliavin derivatives of the solution in terms of the fundamental solution of the wave solution. We present two applications: (1) We present quantitative central limit theorems for spatial averages of the solution to the hyperbolic Anderson model, where the rates of convergence are described by the total variation distance. These quantitative results have been elusive so far due to the temporal correlation of the noise blocking us from using the Itô calculus. (2) We establish the absolute continuity of the law for the hyperbolic Anderson model. The Lp-estimates of Malliavin derivatives are crucial ingredients to verify a local version of Bouleau-Hirsch criterion for absolute continuity. Our approach substantially simplifies the arguments for the one-dimensional case, which has been studied in the recent work by Balan, Quer-Sardanyons and Song (2019). This talk is based on the joint work (arXiv:2101.10957) with *R. Balan*, *D. Nualart* and *L. Quer-Sardanyons* (2021). - - - Maurizia Rossi Dipartimento di Matematica e Applicazioni Università di Milano-Bicocca

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Seminar Antonio Linero @Bocconi - May 6th
by Giacomo Zanella 03 May '21

03 May '21

We announce the following DEC Statistics webinar at Bocconi: Date: Thursday, May 6, h17:00 (Italy time) Speaker: Antonio Linero (UT Austin) Title: Bayesian Decision Tree Ensembling Strategies for Nonparametric Problems Abstract: In this talk we will make the case for using Bayesian decision tree ensembles, such as Bayesian additive regression trees (BART), for addressing some fully-nonparametric problems. We present models for density regression and survival analysis, and argue that our approaches are both easier to use and more effective than more standard Bayesian nonparametric solutions (such as those based on mixture models). On the applied side, we show how to use our models to extract interesting features across several datasets. On the theoretical side, we also show that our models attain minimax-optimal rates of convergence of the posterior in high-dimensional settings. Throughout the talk, we will emphasize the flexibility and ease-of-use of our approach: all simulation and real data analyses attain excellent results using heuristically chosen "default" priors, and it is quite straight-forward for researchers (both in-principle and in-practice) to embed our ensembles in larger models. The webinar will be on zoom at: https://zoom.us/j/95265599865?pwd=NlEwVWFjNktjNkx5VjZFZmFLVGh0UT09 Meeting ID: 952 6559 9865 Passcode: 634366 Kind regards, Giacomo Zanella

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Fwd: PhD and postdoc position
by Francesco Caravenna 30 Apr '21

30 Apr '21

Ricevo e inoltro. > Da: Martina Hofmanova <hofmanova(a)math.uni-bielefeld.de> > Oggetto: PhD and postdoc position > Data: 30 aprile 2021 11:04:15 CEST > > Dear colleagues, > > I would like to draw your attention to the open positions (1 postdoc, 1 PhD student) in my group (the starting date is flexible) > > https://uni-bielefeld.hr4you.org/job/view/466/research-position?page_lang=en <https://uni-bielefeld.hr4you.org/job/view/466/research-position?page_lang=en> > > https://uni-bielefeld.hr4you.org/job/view/477/research-position?page_lang=en <https://uni-bielefeld.hr4you.org/job/view/477/research-position?page_lang=en> > > I would be happy if you could share the information further and forward it to possible candidates. > > Thank you in advance. > > Best regards, > Martina

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