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Many faces of renormalization
Simons Center (SCGP), Stony Brook, NY
March 8-12, 2021

Organized by: Dzmitry Dudko, Mikhail Lyubich and Konstantin Khanin

The goal of this Workshop is to explore connections between various
aspects of Renormalization in Dynamics (unimodal and circle, holomorphic and cocyclic, Henon, KAM, and stochastic renormalizations) and Physics (QFT and statistical mechanics, fluid dynamics, and KPZ), which could help to reveal a unifying theme for all these phenomena.

This workshop is part of the Program: Renormalization and universality in Conformal Geometry, Dynamics, Random Processes, and Field Theory. There will also be Renormalization retrospective: Feigenbaum Memorial Conference held right before.

Renormalization retrospective: Feigenbaum Memorial Conference
Simons Center (SCGP) Stony Brook, NY
March 4-7, 2021

Organizers: Kostya Khanin, Misha Lyubich, and Dennis Sullivan

     This Conference will pay tribute to the great discovery made by Feigenbaum in the mid 1970s and its ramifications (mostly in math) in the past 45 years. It will also serve as an introduction to the SCGP Workshop Many faces of renormalization held during the following week. Both events are part of the Program: Renormalization and universality in Conformal Geometry, Dynamics, Random Processes, and Field Theory:

International Centre for Theoretical Physics ICTP Trieste, Italy

October 12 -16, 2020

The workshop at ICTP in October is part of a long standing tradition of Dynamical Systems and Ergodic Theory activities at ICTP that was initiated by J. Palis and C. Zeeman in the early 1980s, and continued by Ya. Sinai, J.-C. Yoccoz and others.

We can provide local support for up to 100 participants in shared rooms in the ICTP guesthouses, and some limited travel support only for participants from developing countries.

Online applications here: 

Organizers: Jacopo De Simoi (Toronto, Canada), Corinna Ulcigrai (Zurich, Switzerland), Marcelo Viana (IMPA, Rio de Janeiro, Brazil), Local Organiser: Stefano Luzzatto

Laboratoire Paul Painlevé, Université de Lille, France

June 29 to July 3, 2020

ACQUA20, a Summer School in Complex Dynamics and related topics, to be held from June 29 to July 3, 2020, at the Laboratoire Paul Painlevé, Université de Lille

The Summer School is specifically aimed at students, postdocs and young researchers. It will run from June 29 to July 2 and will consist of three courses:
"Distribution of zeros of random holomorphic sections" by George Marinescu (Cologne);
"Dynamics of singular Riemann Surfaces foliations" by Nessim Sibony (Orsay);
"Random complex dynamics” by Anna Zdunik (Warsaw).

Online applications: 

The deadline for registering is April 30, 2020. No registration will be accepted after this deadline.
We should have some funds to support the accommodation and local expenses of some participants, with priority to PhD students and Postdocs. If you need financial support please don't hesitate to contact us, mentioning it in your registration.

The organizing committee:  Fabrizio Bianchi, George Marinescu, Volker Mayer, Viet-Anh Nguyen, Gabriel Vigny

Indiana University Purdue University Indianapolis
May 18-22, 2020

This school is primarily for the following three (overlapping) groups of people who want to learn about complex dynamics in several variables:

1. Graduate students and postdocs,
2. People working on complex dynamics in one variable, and
3. People working on several complex variables non-dynamically.

Whenever possible, topics will be explained first in one-dimension and then the techniques will be extended to higher dimensions.


Eric Bedford (Institute for Math Sciences at Stony Brook)
Jeffrey Diller (University of Notre Dame)
Charles Favre (Ecole Polytechnique)
John Hubbard * (Cornell University)
Mattias Jonsson (Universtiy of Michigan)
Kyounghee Kim (Florida State University)
Mikhail Lyubich * (Institute for Math Sciences at Stony Brook)
Martin Sombra * (ICREA - Universitat de Barcelona)

* To be confirmed


Ivan Chio
Scott Kaschner
Juan Rivera-Letelier
Roland Roeder

Monday-Tuesday: Learning talks by and for graduate students and postdocs. Topics and material to be provided.
Wednesday-Friday: Mini-courses by experts in the field, directed to graduate students, postdocs, and researchers.


Available for US-based people from the National Science Foundation grant DMS-1348589. Priority will be to graduate students, postdocs, and other early career mathematicians. Please apply by March 31st for full consideration.

To participate, please write to indicating:

1. What days you would like to attend;
2. If you are asking for travel support.

Graduate students and postdocs, also indicate:

3. If you would like to give a learning talk on Monday and Tuesday;
4. Your advisor/mentor.

Reminder: if you are offered support and plan to fly to the meeting, you must fly on a US-based airline to be reimbursed for your flight.

Stony Brook University, Simons Center for Geometry and Physics ( SCGP )

February 3 - June 5, 2020

The goal of the program is to bring together mathematicians and physicists working on various aspects of renormalization in dynamical systems. The idea of ​​renormalization group emerged in Quantum Field Theory. Later, in the 1960s, it became a major tool in Statistical Mechanics in the analysis of phase transitions and critical phenomena. One can say that the ideas of renormalization group have revolutionized the field. This development culminated in Wilson's expansion based on his ideas on intrinsic relation between physical parameters in different scales.

In the 1970s the renormalization ideology was transferred to Dynamics in the context of Universality discoveries by Feigenbaum, Coullet and Tresser, and has since become one of the most powerful tools of understanding small scale structure of a large variety of systems. It has become particularly well (and rigorously) developed in the Conformal context, in particular, in the geometric problems related to the celebrated MLC Conjecture on the local connectivity of the Mandelbrot set.

Today, the renormalization ideas have penetrated deeply into many areas of Mathematics and Physics, but an explicit relation between various areas often remains elusive. One of our goals is to look for a unifying approach that would cover various manifestations of the renormalization.

Kostya Khanin, University of Toronto, Canada; Misha Lyubich, Stony Brook University

There are a few workshops associated with this program:
Analysis, Dynamics, Geometry and Probability: March 2-6, 2020
Renormalization retrospective: Feigenbaum Memorial Conference: May 28-29, 2020
which will serve as an introduction to the SCGP Workshop Many Faces of Renormalization: June 1-5, 2020

Facultad de Matemáticas , Universidad Católica UC, Santiago, Chile

January 6 - 10, 2020

The aim of the workshop is to bring together experts working in holomorphic dynamics in low dimensions and the exchange of new ideas for research directions.

ICERM, Brown University in Providence, Rhode Island

November 2-3, 2019

Thurston maps are orientation-preserving branched covering maps of the two-sphere to itself for which the orbits of the branch points form a finite set. They arise in the classification of complex dynamical systems.

Académie des Sciences, Institut de France
October 1, 2019

The Academy of Sciences is happy to invite you to the conference " Two mathematicians in search of harmony and chaos tribute to Michael Herman and Jean-Christophe Yoccoz " that held the 1 st October 2019 10h to 17h in Great hall of sessions of the Institute of France ( 23 quai de Conti 75006 ). You will find the program as an attachment.

At this occasion, Alain Chenciner Etienne Ghys , Bassam Fayyad , Marguerite Flexor, Patrice Le Calvez , Yves Meyer, Harold Rosenberg and Carlos Matheus Silva Santos return on contributions and personalities of these two scientists out of the common.

Euler International Mathematical Institute, Saint Petersburg, Russia
August 19-23, 2019

Dedicated to the 100th birthday anniversary of Vladimir Rokhlin (1919 - 1984)

Here is the link to the poster :