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Secondo annuncio: Mini-corso "Martingale Optimal Transport" del prof. Nizar Touzi a Pisa
by Salvatore Federico 05 Dec '15

05 Dec '15

Si ricorda che nei giorni 9-11 dicembre il prof. Nizar Touzi dell'Ecole Polytechnique di Parigi terra' un mini-corso dal titolo "Martingale Optimal Transport" presso il Dipartimento di Matematica dell'Universita' di Pisa. L'abstract ed il calendario sono riportati di seguito. -------------------------------------------------------------- - MER 9/12: ore 16 - 18 (Aula riunioni) - GIO 10/12: ore 10 - 12 (Aula seminari) - GIO 10/12: ore 15 - 17 (Aula seminari) - VEN 11/12: ore 9 - 13 (Aula seminari) Abstract: We provide an introduction to martingale optimal transport. In the context of the one-period version of the problem, we establish the Kantorovitch duality, we discuss the existence for the primal and the dual problems, and we provide the martingale version of the cyclic monotonicity condition together with of the one-dimensional Brenier theorem. We finally show the connection between continuous-time martingale transport and the Skorohod embedding problem, and we provide some applications. Salvatore Federico

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Fwd: School and Workshop on Random Interacting Systems in Bath, UK
by Faggionato, Alessandra 04 Dec '15

04 Dec '15

School and Workshop on Random Interacting Systems 19-24 June 2016, in Bath, U.K. Registration is open until 25th March 2016 at http://people.bath.ac.uk/ados20/ris2016/ MINI-COURSES ============ Michael Damron (Georgia Institute of Technology) Geodesics in first-passage percolation Ron Peled (Tel Aviv University) The spin and loop O(n) models INVITED SPEAKERS ================ Krzysztof Burdzy (University of Washington) Manuel Cabezas (PUC Chile) Elisabetta Candellero (University of Warwick) Pietro Caputo (Roma Tre) Shirshendu Ganguly* (University of Washington) Jack Hanson (CCNY) Dmitry Ioffe (Technion) Elena Kosygina (Baruch College, CUNY) Fabio Martinelli* (Roma Tre) Allan Sly* (UC Berkeley) Yinon Spinka (Tel Aviv University) Alain-Sol Sznitman (ETH Zurich) Vincent Tassion (Universite Geneve) Balint Toth (Bristol & TU Budapest) Daniel Ueltschi (University of Warwick) * = to be confirmed. There will be slots for a small number of contributed talks (with preference to PhD students and post-docs). If you are interested, send title and abstract during registration at http://people.bath.ac.uk/ados20/ris2016/ We look forward to seeing you in Bath. Vladas Sidoravicius and Alexandre Stauffer -- Prof. Alessandra Faggionato Department of Mathematics University La Sapienza Piazzale A. Moro, 2 00186 Rome - Italy

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Annuncio seminario Prof. Meilijson
by Cristina Zucca 04 Dec '15

04 Dec '15

********************************************************************* SEMINARI DI PROBABILITA' E STATISTICA MATEMATICA DIPARTIMENTO DI MATEMATICA "G. PEANO" UNIVERSITA' DEGLI STUDI DI TORINO ********************************************************************* Lunedì 14 Dicembre 2015 alle ore 15:00 in Aula C presso il Dipartimento di Matematica "G. Peano" dell'Università degli Studi di Torino, Via Carlo Alberto 10, Il Prof. Isaac Meilijson (Department of Statistics and Operations Research · School of Mathematical Sciences; Tel Aviv University) terrà un seminario dal titolo How variable can a martingale with a given final variance be? Abstract: The ratio between the expected diameter (maximum-minimum) of an L2-bounded martingale and the standard deviation of its last term cannot exceed √3 (Dubins, Gilat & Meilijson). This extends the Dubins & Schwarz respective bounds 1 and √2 for the ratios between the expected maximum and maximal absolute value of the martingale and the standard deviation of its last term. All three will be reviewed in a unified way, by showing that these problems can be reduced to finding some optimal stopping times in Brownian Motion. ------------------------------------------------------------------------------------------------------ Tutti gli interessati sono invitati a partecipare Cristina Zucca -- Dr. Cristina Zucca Department of Mathematics University of Torino Via Carlo Alberto 10 10123 Torino, Italy tel: +39-011-6702850 fax: +39-011-6702878

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Seminario Ilaria Spassiani a RM1
by Nappo, Giovanna 03 Dec '15

03 Dec '15

*********************************************************************************************** SEMINARI DI PROBABILITA' E STATISTICA MATEMATICA *********************************************************************************************** Dipartimento di Matematica G. Castelnuovo Sapienza, Università di Roma piazzale A. Moro 2, Roma *********************************************************************************************** Mercoledì 9 dicembre 2015 Ore 11:30, Aula di Consiglio Seminario di Probabilità e Statistica Matematica/Presentazione Tesi di Dottorato Ilaria Spassiani (Sapienza Università di Roma) Un nuovo modello ETAS per terremoti con magnitudo dipendenti Il classico modello ETAS temporale per sequenze sismiche fa parte della classe di processi di Hawkes con marche indipendenti. Tuttavia, poiché l'ipotesi di dipendenza tra le magnitudo è supportata da analisi statistiche, proponiamo una nuova versione dell'ETAS temporale, in cui le magnitudo degli aftershocks (eventi triggerati) dipendono dalle magnitudo dei rispettivi eventi madre (eventi triggeranti) attraverso una probabilità di transizione tale che, in accordo con i risultati sperimentali, (i) eventi triggerati con magnitudo grande/piccola sono più probabili se scatenati da eventi triggeranti con magnitudo grande/piccola; (ii) tutte le magnitudo seguono la stessa legge esponenziale di Gutenberg-Richter, ovvero la sua densità è autofunzione di un opportuno operatore. Infine, discuteremo la non esplosione del modello, l'approssimazione della probabilità di zero eventi in [0,t], per t piccolo, ed interpreteremo i risultati come un'approssimazione della densità comune degli intertempi. *********************************************************************************************** Tutti gli interessati sono invitati a partecipare Giovanna Nappo ***********************************************************************************************

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posizioni di post-doc e borse per studenti di master c/o centro Lebesgue
by Marco Romito 03 Dec '15

03 Dec '15

segnalo per gli interessati. ---------------------------------------------------- The Lebesgue Center invites to apply for post-doctoral positions in mathematics for a period of six months to a year (renewable once). The hired applicant will conduct his/her research at one of these Institutes: IRMAR (Rennes), LMJL (Nantes), LMBA (Brest and Vannes), LAREMA (Angers). The position is open to all research areas present within the four Institutes. It does not include an obligation to teach. The net salary will be 2 225 Euros per month. Deadline: April 15, 2016. http://www.lebesgue.fr/ ---------------------------------------------------- The Lebesgue Center offers 10,000€ scholarships to outstanding mathematics students applying for a master programme in mathematics, for a fist year of Master (M1) or for a second year of Master (M2), in Rennes, Nantes, Angers, Brest or Vannes. Deadline: March 10, 2016. http://www.lebesgue.fr/

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Seminario Valeria Bignozzi
by Gabriele Stabile 03 Dec '15

03 Dec '15

Mercoledì 9 Dicembre, alle ore 13, presso l'Aula Fanfani al 5° piano del Dipartimento MEMOTEF (Sapienza Università di Roma, Via del Castro Laurenziano 9, Roma), si terrà il seminario: "How superaddittive can a risk measure be?" Speaker: Velaria Bignozzi (Sapienza University of Rome). ABSTRACT ************** Risk measures that are not subadditive may penalize the aggregation of risk, by inducing portfolio requirements that are larger than those of undiversified positions. This happens for instance for Value-at-Risk (VaR), as well as convex shortfall risk measures. In this paper we characterize the potential for superadditivity that any risk measure may exhibit, considering both dependence uncertainty as well as the effect of portfolio size. It is shown that for the wide majority of risk measures of use or interest this corresponds to calculating the smallest dominating coherent risk measure (SDCRM). We show that this risk measure often exists and is identified with the notion of extreme-aggregation risk measure introduced in this paper. Explicit results are provided for the class of distortion risk measures, where the SDCRM is again a distortion risk measure and for the class of shortfall risk measures, where the SDCRM is given by an expectile. Tutti gli interessati sono invitati a partecipare. Cordiali saluti, Gabriele Stabile

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Fwd: Saint-Flour 2016
by Marco Romito 02 Dec '15

02 Dec '15

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Seminario di Probabilita' - Universita' di Padova
by alessandra bianchi 01 Dec '15

01 Dec '15

Ho il piacere di invitarvi al seguente seminario, che si terrà giovedì 10 dicembre, alle 11:30, in Aula 2BC30 della Torre Archimede presso il Dipartimento di Matematica dell'Università degli Studi di Padova. SPEAKER: Sander Dommers AFFILIATION: Ruhr University Bochum TITLE: Metastability in the reversible inclusion process ABSTRACT: In the reversible inclusion process with N particles on a finite graph, each particle at a site x jumps to site y at rate (d+n_y) r(x,y), where d is a diffusion parameter, n_y is the number of particles on site y and r(x,y) is the jump rate from x to y of an underlying reversible random walk. When the diffusion d converges to 0 as N goes to infinity, the particles cluster together to form a condensate. It turns out that these condensates only form on the sites where the underlying random walk spends the most time. Once such a condensate is formed the particles stick together and the condensate performs a random walk itself on much longer timescales, which can be seen as metastable behavior. We study the rates at which the condensate jumps and show that in the reversible case there are several time scales on which these jumps occur depending on how far (in graph distance) the sites are from each other. This generalizes work by Grosskinsky, Redig and Vafayi who study the symmetric case where only one timescale is present. Our analysis is based on the martingale approach by Beltrán and Landim. This is work in progress jointly with Alessandra Bianchi and Cristian Giardinà. -- Alessandra Bianchi Dip. di Matematica Università di Padova Via Trieste, 63 - 35121 Padova, Italy phone: +39 049 827 14 06 fax: +39 049 827 14 28 e-mail: bianchi(a)math.unipd.it http://www.math.unipd.it/~bianchi/

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internship position "An analysis of the firebrand landing distributions" at BCAM, Bilbao
by Gianni Pagnini 01 Dec '15

01 Dec '15

Dear all, an internship position is open at BCAM www.bcamath.org [1], Bilbao, Basque Country - Spain, on the topic "AN ANALYSIS OF THE FIREBRAND LANDING DISTRIBUTIONS" related to a ongoing research on modelling wildland fire propagation. The deadline for application submission is the 20th of January, 2016. http://www.bcamath.org/en/research/internships [2] http://www.bcamath.org/documentos_public/archivos/internships/SP_FirebrandL… [3] For information you can contact Inderpreet kaur: ikaur(a)bcamath.org. Sincerely, Gianni Pagnini -- Gianni Pagnini Ikerbasque Research Fellow BCAM - Basque Center for Applied Mathematics Alameda de Mazarredo, 14 E-48009 Bilbao, Basque Country - Spain Tel. +34 946 567 842 gpagnini(a)bcamath.org | www.bcamath.org/gpagnini [4] _ _ _(__ __matematika mugaz bestalde )_ Links: ------ [1] http://www.bcamath.org [2] http://www.bcamath.org/en/research/internships [3] http://www.bcamath.org/documentos_public/archivos/internships/SP_FirebrandL… [4] http://www.bcamath.org/gpagnini

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postdoc position on "Stochastic Processes for Anomalous Diffusion" at BCAM, Bilbao
by Gianni Pagnini 01 Dec '15

01 Dec '15

Dear all, I would like inform you about a call for a 2-year postdoc position at BCAM - Basque Center for Applied Mathematics [1], Bilbao, Basque Country - Spain. The topic is "Stochastic Processes for Anomalous Diffusion" and the deadline for submission of applications the 30th of December, 2015. Here is the link http://www.bcamath.org/en/research/job/ic2015-winter-postdoctoral-fellowshi… [2] The applicant should select the research line SP-Statistical Physics. Please, share this announcement with any colleague and applicant that could be interested. Questions can be sent to me gpagnini(a)bcamath.org. Thank you very much. Regards, Gianni -- Gianni Pagnini Ikerbasque Research Fellow BCAM - Basque Center for Applied Mathematics Alameda de Mazarredo, 14 E-48009 Bilbao, Basque Country - Spain Tel. +34 946 567 842 gpagnini(a)bcamath.org | www.bcamath.org/gpagnini [3] _ _ _(__ __matematika mugaz bestalde )_ Links: ------ [1] http://www.bcamath.org/ [2] http://www.bcamath.org/en/research/job/ic2015-winter-postdoctoral-fellowshi… [3] http://www.bcamath.org/gpagnini

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