For internal use only

Sébastien Clesse

External collaborator

UCL member card
Research directions:
Cosmology and General Relativity
Data analysis in HEP experiments

Experiments and collaborations:

Active projects
Gravitational Wave Physics with Virgo
Diego Bardiaux, Giacomo Bruno, Federico De Lillo, Antoine Depasse, Jan Govaerts, Jean-Marc Gérard, Vincent Lemaitre, Andrew Miller, Krzysztof Piotrzkowski, Andres Tanasijczuk, Joris van Heijningen

In July 2018 CP3 members have joined the Virgo Collaboration at the European Gravitational Observatory (EGO) near Pisa in Italy. Virgo is the European laser interferometer for gravitational wave detection. After several years of instrument upgrades, Virgo went in observation mode in August 2017, about one year and half after the two LIGO interferometers in the US had detected for the first time gravitational waves. Virgo and LIGO work in close collaboration, sharing data, analysing data and publishing together. Fundamental research in gravitational wave experimental physics was funded for the first time in Belgium at the end of 2018 with a project led by UCLouvain and ULiege. On the data analysis side the plan is on one side to investigate the properties of binary black hole coalescence events, possibly relating them to theoretical models of dark matter and/or primordial black holes, and on the other to search for a stochastic gravitational wave background originating from the very early moments of the life of the Universe, a discovery that would be foundational for cosmology. On the instrumentation side, contributions to computing and the optical system of the Virgo interferometer are planned.
CP3 members are also actively supporting the Einstein Telescope project, a proposed underground laser interferometer project for gravitational wave detection that is expected to take over from LIGO and Virgo around 2030.

Non-active projects
Publications in CP3
All my publications on Inspire

Number of publications as CP3 member: 10 Download BibTeX

Last 5 publications


CP3-18-15: Cosmology in the era of Euclid and the Square Kilometre Array
Sprenger, Tim and Archidiacono, Maria and Brinckmann, Thejs and Clesse, Sébastien and Lesgourgues, Julien

[Abstract] [PDF] [Journal] [Dial]
48 pages, 11 figures, 8 tables
Refereed paper. February 6.


CP3-17-61: LIGO Lo(g)Normal MACHO: Primordial Black Holes survive SN lensing constraints
Garcia-Bellido, Juan and Clesse, Sebastien and Fleury, Pierre

[Abstract] [PDF] [Journal] [Dial]
7 pages, 7 figures
Refereed paper. December 21.
CP3-17-60: Seven Hints for Primordial Black Hole Dark Matter
Clesse, Sebastien and García-Bellido, Juan

[Abstract] [PDF] [Journal] [Dial]
11 pages, 3 figures
Refereed paper. December 21.
CP3-17-59: Constraints from microlensing experiments on clustered primordial black holes
García-Bellido, Juan and Clesse, Sebastien

[Abstract] [PDF] [Journal] [Dial]
6 pages, 3 figures
Refereed paper. December 21.


CP3-11-16: Observational signatures of a non-singular bouncing cosmology
Marc Lilley, Larissa Lorenz, Sebastien Clesse

[Abstract] [PDF] [Journal] [Dial]
Published in JCAP 06 (2011) 004.
Refereed paper. April 19.

More publications