Free Probability

Conference on the occasion of Roland Speicher's 60th birthday

Saarland University, Saarbrücken, Germany

(was: Mon 8 June - Fri 12 June, 2020)

Unfortunately, due to the current pandemic, we have to cancel the conference and postpone it to an indefinite date in the future.

Since its initiation in the 1980s by Voiculescu, free probability theory has always been expanding and today it is as timely as ever. It is linked to theoretical fields such as operator algebras, representation theory of groups and quantum information theory but also to more applied fields such as random matrix theory, wireless communications and various others. The common themes are noncommutativity of certain variables and the description of an asymptotical behaviour. The aim of the conference is to bring together leading experts in free probability theory in order to exchange recent developments, survey the broadness of the field and to explore new directions.

We dedicate this conference to Roland Speicher on the occasion of his 60th birthday. We recall his vast contributions to free probability, such as his work on a combinatorial approach to freeness using cumulants and partitions of sets, free central limit theorems, universal products, R-diagonal operators, second order freeness, operator-valued free probability, free Brownian motion, q-Gaussians, Boolean convolution, fourth moment theorems and de Finetti theorems, just to name a few.
Undoubtedly, Roland Speicher has been one of the founding fathers of free probability theory, he has always been a central player in the development, broadening and community building of the field and he is still one of the key figures in the domain.
With this conference, we intend to express our appreciation for Speicher's life long efforts for the field and we aim at contributing to a continuation of his personal work on free probability as well as to keep his spirit alive that free probability should be open to influences and interactions with many other fields.



If you want to participate in the conference, please send an email to Moritz Weber.
There is limited financial funding available in exceptional cases. For speakers, accommodation will be covered.
There is no registration fee. Below are some information on hotels.



        ° speaker         * to be confirmed

Michael Anshelevich °
Octavio Arizmendi Echegaray °
Benson Au
Marwa Banna
Serban Belinschi °
Hari Bercovici °
Philippe Biane °
Marek Bozejko °
Michael Brannan
Guillaume Cebron
Adrian Celestino Rodriguez
Benoit Collins °
Ken Dykema °
Kurusch Ebrahimi-Fard
Wiktor Ejsmont
Uwe Franz
Daniel Gromada
Brian Hall
Michael Hartz
Ching Wei Ho
Johannes Hoffmann
David Jekel
Georgios Katsimpas
Todd Kemp °
Claus Köstler °
Burkhard Kümmerer °
Franz Lehner
Felix Leid
Weihua Liu *
Laura Maaßen
Tobias Mai °
Camille Male
Alexander Mang
James Mingo °
Peter Neu
Alexandru Nica °
Jonathan Novak
Daniel Perales Anaya
Gilles Pisier °*
David Renfrew
Christophe Reutenauer °
Simon Schmidt
Michael Schürmann °
Dimitri Shlyakhtenko °
Michael Skeide °
Paul Skoufranis
Piotr Sniady °
Roland Speicher
Kamil Szpojankowski
Pierre Tarrago °
Carlos Vargas Obieta °
Monika Varso
Philipp Varso
Yoshimichi Ueda
Dan-Virgil Voiculescu °
Jonas Wahl
Wilhelm von Waldenfels °
Simeng Wang
Moritz Weber
Sheng Yin

Schedule and venue

The conference begins on Monday (8 June) morning and ends on Friday (12 June) afternoon.
The conference dinner on Friday evening will be dedicated to Roland Speicher's birthday.

The talks take place at the Faculty of Mathematics, Saarland University, Saarbrücken, buildings E2 2, E2 4 and E2 5, here is a map (PDF).

Travel information

Saarbruecken has its own airport, but it is very small. The best option for a flight destination is Frankfurt Airport. You should then take a (direct) train to Saarbrücken (about 2 hours). Alternatively, you can fly to Luxemburg (and then take a bus, 1 hour) or to Paris (and then take a non-direct train, 2-3 hours).

Feel free to contact us if you need help when booking a hotel. We have blocked a number of rooms in the following hotels:

Hotel Madeleine (city center, 71 Euro, includes breakfast)
Hotel Stadt Hamburg (city center, 77 Euro per night, includes breakfast)
Domicil Leidinger (city center, 82 Euro per night, includes breakfast (best breakfast in town))
Hermann-Neuberger-Sportschule (Saar FV) (on campus, some kind of students dorm, 41 Euro per night, includes breakfast)
Landessportverband (on campus, some kind of students dorm, 41 Euro per night, includes breakfast)

Other options:
Hotel Schlosskrug (close to the city center, lower prized)
Motel One (city center, 89 Euro plus 11,50 for the breakfast)
For more detailed information (such as on busses in Saarbrücken), see the page information for visitors.

Postal address

Saarland University
Department of Mathematics
Postfach 15 11 50
66041 Saarbrücken



Saarland University
Campus building E 2 4
66123 Saarbrücken

Information for visitors