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Seminario di Probabilita` e Stastistica
by Faggionato, Alessandra 08 Nov '18

08 Nov '18

scusate ma mancava il titolo nel mio annuncio precedente: Seminario di Probabilita` e Stastistica Martedi 13 novembre ore 14:00, Aula di Consiglio, Dipartimento di Matematica, La Sapienza. Titolo: Effects of prior selection in nonparametric Bayes problems Speaker: Tomasz Rychlil (Istituto di Matematica dell'Accademia Polacca delle Scienze) Abstract: We consider an arbitrary family of stochastically ordered distribution functions dependent on parameters from an interval in the real line. We compare distribution functions and moments of random variables with distribution functions being the mixtures of the members of the above stochastically ordered family. In particular, we determine lower and upper bounds on the values of one mixture distribution function under the condition that the other mixture distribution is arbitrarily fixed. We also evaluate the differences between the expectations of mixture variables in various scale units. The results are illustrated by some examples. -- ************************************************* 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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Seminario di Probabilita` e Statistica a Roma1
by Faggionato, Alessandra 08 Nov '18

08 Nov '18

Seminario di Probabilita` e Stastistica Martedi 13 novembre ore 14:00, Aula di Consiglio, Dipartimento di Matematica, La Sapienza. Speaker: Tomasz Rychlil (Istituto di Matematica dell'Accademia Polacca delle Scienze) Abstract: We consider an arbitrary family of stochastically ordered distribution functions dependent on parameters from an interval in the real line. We compare distribution functions and moments of random variables with distribution functions being the mixtures of the members of the above stochastically ordered family. In particular, we determine lower and upper bounds on the values of one mixture distribution function under the condition that the other mixture distribution is arbitrarily fixed. We also evaluate the differences between the expectations of mixture variables in various scale units. The results are illustrated by some examples. -- ************************************************* 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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Call for PostDoc position at University of Oslo
by Giulia Di Nunno 08 Nov '18

08 Nov '18

Dear Colleague, this is to draw your attention to the call for a PostDoc at the University of Oslo in stochastic analysis and its applications. The position is within the scopes of the project STORM “Stochastics for Time-Space Risk Models" http://www.mn.uio.no/math/english/research/projects/storm/index.html <http://www.mn.uio.no/math/english/research/projects/storm/index.html> Description and call: https://www.jobbnorge.no/en/available-jobs/job/159884/postdoctoral-research… <https://www.jobbnorge.no/en/available-jobs/job/159884/postdoctoral-research…> The deadline of application is November 30th, 2018. Please help to advertise these calls and bring them to the attention of your colleagues and possible candidates. Thank you in advance! Best wishes Giulia --- Giulia di Nunno Professor Department of Mathematics University of Oslo http://folk.uio.no/giulian/ <http://folk.uio.no/giulian/>

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seminario 13 novembre 9, 30 al Politecnico di Torino DISMA
by Enrico Bibbona 06 Nov '18

06 Nov '18

Martedi' 13 novembre alle 9,30 in Aula Buzano (Politecnico di Torino, DISMA) il prof Badal Joshi (California State University San Marcos) terrà un seminario dal titolo Graphical symmetries of reaction networks and their stationary measures Abstract: Reaction networks are used to model chemical reactions, biochemical reactions, interacting populations in ecology, genetics and infectious disease dynamics among many other systems. Depending on the system scale, three most commonly used models are continuous-time Markov chain (CTMC), stochastic differential equations and ordinary differential equations (ODE). With increased data and scientific focus shifting towards biochemistry which often involves populations as small as few tens of molecules, CTMC models have seen dramatic increase in relevance. The long-term dynamics of a continuous-time Markov chain model are described by its stationary distribution. In general, the explicit form of the stationary distribution is impossible to obtain even for very small networks. However, when the network has some natural symmetries, we can obtain the explicit stationary distribution and it can be connected with the equilibria of the corresponding ODE system. We will discuss the symmetries of reaction balance, complex balance, reaction vector balance, and cycle balance and their properties in both the deterministic (ODE) setting and stochastic (CTMC) setting. We will also discuss the relations between the various forms of balance and the connection with existence and form of the stationary distribution. Cordialmente, Enrico Bibbona Probability, Statistics and Optimization group Department of Mathematical Sciences "G. L Lagrange" Politecnico di Torino

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seminario Felix Liebrich - 22 novembre
by Emanuela Rosazza 06 Nov '18

06 Nov '18

Si avvisa che il giorno giovedì 22 novembre alle ore 14 presso l’Università di Milano- Bicocca (via degli Arcimboldi 8 - edificio U7, quarto piano- aula 4026) si terrà il seguente seminario: Speaker: Felix-Benedikt Liebrich (LMU Muenchen, Germany) Titolo: “Sharing utility and risk under (partial) law-invariance” Abstract: The so-called risk sharing problem has two variants: (1) How can an aggregation of individual utilities within a system of agents be maximised by means of distributing a certain good, or (2) how can an aggregation of individual risks be minimised by means of redistributing a certain loss the system incurs? The problem has a long history in economics and financial mathematics, and solving it in relevant infinite dimensional spaces is very challenging. Substantial results have been obtained in the context of Pareto efficiency of such sharing schemes when law-invariant (risk) preferences are involved. These rank Savage acts -- random variables -- in a way which only depends on their distribution under a fixed reference probability measure. It was shown that Pareto efficient allocations (i.e. sharing schemes) exist. For problem (1) of maximising aggregated utility, the talk presents a unifying framework in which solutions to the risk sharing problem can be found. As applications, we will discuss the existence of weakly Pareto efficient allocations, Pareto efficient allocations, and core allocations. In a second part, we solve the risk sharing problem (2) for a wide class of capital requirements determining individual risks. These will not be law-invariant functionals, but build on a law-invariant ingredient. The talk is based on joint work with Gregor Svindland. Tutti gli interessati sono invitati a partecipare. Un saluto cordiale, Emanuela ******************************************************************************************* Emanuela Rosazza Gianin Dipartimento di Statistica e Metodi Quantitativi Università di Milano-Bicocca Edificio U7 – 4° Piano Via Bicocca degli Arcimboldi, 8 20126 Milano Tel. 02 64483208 Fax. 02 64483105 e-mail: emanuela.rosazza1(a)unimib.it *******************************************************************************************

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Bernoulli Society New Researcher Award
by Antonio DI CRESCENZO 02 Nov '18

02 Nov '18

The Bernoulli Society welcomes applications to the New Researcher Award 2020. Each awardee shall deliver a talk at a special invited session during the World Congress in Probability and Statistics 2020, and will receive a funding up to 1000€ to offset travel and other expenses. Bernoulli News will publish their pictures and a paragraph about their work. Eligible candidates are active researchers in Probability Theory who obtained the PhD degree on or after Jan 1st 2014 and who are regular members of the Bernoulli Society. Female candidates get 1 extra year for each child born since receiving the PhD. Candidates should apply through the web form https://goo.gl/forms/v8zDJaFUKj5IGEG73 and send the required documents to the e-mail address indicated there. Deadline: March 15th, 2019 Link: http://bernoulli-society.org/index.php/prizes/267-bernoulli-society-new-res… -- ============================================= Antonio Di Crescenzo Dipartimento di Matematica Università degli Studi di Salerno Via Giovanni Paolo II, n. 132 <https://maps.google.com/?q=Via+Giovanni+Paolo+II,+n.+132+%0D%0A84084+Fiscia…> 84084 Fisciano (SA) Italy Tel. +39-089-963349 Fax: +39-089-963303 E-mail(1): adicrescenzo(a)unisa.it E-mail(2): adicresc(a)gmail.com Web: http://www.unisa.it/docenti/antoniodicrescenzo/index =============================================

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Avviso di seminario
by Alessandro Ramponi 01 Nov '18

01 Nov '18

Avviso di Seminario Martedì 6 Novembre, ore 14:30 presso la Facoltà di Economia dell'Università di Roma "Tor Vergata" Aula A, Edificio B ELISA ALOS (Università Pompeu Fabra, Barcelona) terrà un seminario dal titolo "On smile properties of volatility derivatives and exotic products: understanding the VIX skew" Abstract. We develop a method to study the implied volatility for exotic options and volatility derivatives with European payoffs such as VIX options. Our approach, based on Malliavin calculus techniques, allows us to describe the properties of the at-the-money implied volatility (ATMI) in terms of the Malliavin derivatives of the underlying process. More precisely, we study the short-time behaviour of the ATMI level and skew. As an application, we describe the short-term behavior of the ATMI of VIX and realized variance options in terms of the Hurst parameter of the model, and most importantly we describe the class of volatility processes that generate a positive skew for the VIX implied volatility. In addition, we find that our ATMI asymptotic formulae perform very well even for large maturities. Several numerical examples are provided to support our theoretical results. -- Dott. Alessandro Ramponi, Ph.D Dipartimento di Economia e Finanza Università degli Studi di Roma Tor Vergata Via Columbia, 2 00133, Roma - Italy e-mail:alessandro.ramponi@uniroma2.it Phone: +39 0672595403 --- Questa e-mail è stata controllata per individuare virus con Avast antivirus. https://www.avast.com/antivirus

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post-doctoral research position
by Francesca Greselin 01 Nov '18

01 Nov '18

*Apologies for cross-posting* Applications are invited *within November 6th, 2018* for a post-doctoral research position (Assegno di Ricerca tipo A2, Junior) in the Dpt of Statistics and Quantitative Methods <http://www.dismeq.unimib.it/en/> at University of Milano-Bicocca <https://www.unimib.it/>. The Department of Statistics and Quantitative Methods is a reference point for researchers in the methodological aspects of *Statistics*, *Mathematics* , *Computer* *Science* and *Foreign Languages*, and in their applications, in particular to the areas of *population* and *society*, *public health, welfare, finance, labor market* and the *energy sector*. TITLE and PROJECT: The candidate should indicate a title, and a research project in view of complementing and integrating undergoing research of faculty members of the Dpt. CONTRACT: 24 months (renewable for a further 24 months upon approval) starting April 1, 2019. Salary competitive with European Research Universities and Italian Assistant Professor position (RTD-A). (gross annual income 19 367 €, net income about € 17 157, monthly € 1 430) APPLICATION: Candidates must possess a Ph.D. in the aforementioned disciplines, either earned within 4 years or to be completed within February 2019. Applications should be submitted online <https://pica.cineca.it/unimib/bando-assegno-di-ricerca-a2-2018/>, deadline November 6, 2018 h 12:00 (CET). Details for submitting a complete application and about the selection procedure are available here <https://www.unimib.it/sites/default/files/ufficio_bandi/bando_assegni_tipo_…> . For more informations francesca.greselin(a)unimib.it

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Torino - Lezione Lagrangiana M. Hairer - 13 Novembre
by Enrico Priola 31 Oct '18

31 Oct '18

Annuncio Lezione Lagrangiana al Dipartimento di Matematica "G. Peano", Universita` di Torino Martedì 13 novembre alle ore 16.30 in Aula A Martin Hairer (Imperial College, London) "Taming Infinities" Abstract: Some physical and mathematical theories have the unfortunate feature that if one takes them at face value, many quantities of interest appear to be infinite! What's worse, this doesn't just happen for some exotic theories, but in the standard theories describing some of the most fundamental aspects of nature. Various techniques, usually going under the common name of “renormalisation” have been developed over the years to address this, allowing mathematicians and physicists to tame these infinities. We will tip our toes into some of the conceptual and mathematical aspects of these techniques and we will see how they have recently been used to study equations whose meaning was not even clear until now. Tutti gli interessati sono invitati a partecipare. Enrico Priola Dipartimento di Matematica Universita' di Torino via Carlo Alberto 10, 10123 TORINO, Italy tel +39 011 6702883 fax +39 011 6702878

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The Aldous spectral gap phenomenon: seminario di Filippo Cesi il 14-11-2018 a Roma Tre
by Pietro Caputo 31 Oct '18

31 Oct '18

Prof. Filippo Cesi Universita' La Sapienza Roma Titolo: THE ALDOUS' SPECTRAL GAP PHENOMENON Mercoledi' 14 Novembre 2018 ORE 16:00 Dipartimento di Matematica e Fisica Universita' degli Studi Roma Tre Largo San Leonardo Murialdo, 1 - Pal.C - Aula 211 Abstract: Some families of Markov chains have a spectral gap which coincides with the spectral gap of an extremely simplified version of the chain. Another way of restating the same concept is: some families of Cayley graphs have a spectral gap which can be found in a very low dimensional representation of the underlying group. We will present a general approach which could be useful when going fishing for this phenomenon in an arbitrary finite group. Two specific examples will be discussed: the case of the symmetric group which corresponds to the "original" Aldous' spectral gap conjecture, proven in 2010 by Caputo, Liggett and Richthammer, and case of the Weyl group W(B_n) we studied in a recent paper.

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