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H 2 Poisson and compound Poisson asymptotics in conventional and nonconventional setups

Auteurs : Kifer, Yuri (Auteur de la Conférence)
CIRM (Editeur )

Résumé : The Poisson limit theorem which appeared in 1837 seems to be the first law of rare events in probability. Various generalizations of it and estimates of errors of Poisson approximations were obtained in probability and more recently this became a popular topic in dynamics in the form of study of asymptotics of numbers of arrivals at small (shrinking) sets by a stochastic process or by a dynamical system. I will describe recent results on Poisson and compound Poisson asymptotics in a nonconventional setup, i.e. for numbers of events of multiple returns to shrinking sets, namely, for numbers of combined events of the type $\left \{ \omega : \xi \left ( jn,\omega\right )\in \Gamma_N,j = 1,...,\ell \right \},n\leq N$ where $\xi \left ( k,\omega \right )$ is defined as a stochastic process from the beginning or it is built from a dynamical system by writing $\xi \left ( k,\omega \right )=T^k\omega .$ We obtain an essentially complete description of possible limiting behaviors of distributions of numbers of multiple recurrencies to shrinking cylinders for $\psi$-mixing shifts. Some possible extensions and related questions will be discussed, as well. Most of the results were obtained jointly with my student Ariel Rapaport and some of them are new even for the widely studied single (conventional) recurrencies case.
Keywords : Poisson limit theorems - nonconventional sums - multiple recurrence

Codes MSC :
37A50 - Relations with probability theory and stochastic processes
37D35 - Thermodynamic formalism, variational principles, equilibrium states
60F05 - Central limit and other weak theorems

 Informations sur la Vidéo Langue : Anglais Date de publication : 22/08/14 Date de captation : 17/07/14 Sous collection : Research talks Format : quicktime ; audio/x-aac arXiv category : Probability ; Dynamical Systems Domaine : Dynamical Systems & ODE ; Probability & Statistics Durée : 01:04:49 Audience : Chercheurs ; Doctorants , Post - Doctorants Download : https://videos.cirm-math.fr/2014-07-17_Kifer.mp4 Informations sur la rencontre Nom de la rencontre : Extreme value theory and laws of rare events / Théorie des valeurs extrêmes et lois des évènements raresOrganisateurs de la rencontre : Freitas, Ana Cristina ; Freitas, Jorge ; Todd, Michael J. ; Vaienti, SandroDates : 14/07/14 - 18/07/14 Année de la rencontre : 2014 URL Congrès : http://www.mcs.st-and.ac.uk/~miket/CIRM_...Citation Data DOI : 10.24350/CIRM.V.18611603 Cite this video as: Kifer, Yuri (2014). Poisson and compound Poisson asymptotics in conventional and nonconventional setups. CIRM. Audiovisual resource. doi:10.24350/CIRM.V.18611603 URI : http://dx.doi.org/10.24350/CIRM.V.18611603

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