The International conference “Particle Physics in the Early Universe” is taking place 14–18 September 2026 in Paris and Orsay.
The conference is co-organized by the Polish Academy of Sciences Scientific Center in Paris, the Institute for Advanced Studies of the University of Warsaw, and IJCLab Orsay. The first day of the conference (Sep 14) will take place in the auditorium Joliot Curie, building 100 at IJCLab in Orsay. The sessions of September 15-18 will be held at the Polish Academy of Sciences Scientific Center, located in the elegant 16th arrondissement of Paris.
The scientific program will explore the interplay between elementary particle physics and early-Universe cosmology, covering topics such as cosmological inflation, dark matter, dark energy, baryogenesis and leptogenesis, phase transitions in the early Universe, and their potential observational signatures, particularly gravitational waves. A central focus will be the cosmological implications of theories beyond the Standard Model and their possible experimental tests. Contributions will be published in a special issue of Acta Physica Polonica B. There is no conference fee for invited participants.
Confirmed speakers include:
Zurab Berezhiani
Nicolas Bernal
Matteo Braglia
Chiara Caprini
Thomas Colas
Joe Conlon
Ed Copeland
Marco Drewes
Emilian Dudas
Ruth Durrer
Joulien Froustey
Yann Gouttenoire
Alejandro Ibarra
Ayuki Kamada
Steve King
Will Kinney
Rocky Kolb
Kamila Kowalska
Fotis Koutroulis
Oleg Lebedev
Marek Lewicki
Marta Losada
Matthew McCullough
Kyohei Mukaida
Marek Olechowski
Marco Peloso
Lucas Pinol
Sébastien Renaux-Petel
Kazuki Sakurai
Mikhail Shaposhnikov
Pedro Schwaller
Pasquale Serpico
Enrico Sessolo
Joe Silk
Juri Smirnov
David Stefanyszyn
Bogumiła Świeżewska
Xi Tong
David Wands
The Organizing Committee:
Adam Falkowski (IJClab Orsay)
Zygmunt Lalak (University of Warsaw)
Yann Mambrini (IJClab Orsay)
Stefan Pokorski (University of Warsaw and Polish Academy of Science)
