Benjamin Racine

Benjamin Racine is a Visiting Fellow at Yale University, where he focuses on observational cosmology, particularly using data from the Dark Energy Science Collaboration (DESC) and the Simons Observatory. Previously, he held a permanent researcher position at the Marseille Particle Physics Center (CPPM, CNRS) since 2020, following postdoctoral roles at the University of Oslo (2014–2017) and Harvard University’s Center for Astrophysics (2017–2020). His work spans cosmic microwave background (CMB) analyses, including contributions to the BICEP/Keck and Planck collaborations, and now centers on using Type Ia supernovae (SN Ia) as distance indicators to probe cosmic expansion and dark energy. He is a key contributor to the Zwicky Transient Facility (ZTF) and the upcoming Legacy Survey of Space and Time (LSST).

Education: PhD in Astroparticle Physics and Cosmology from Université Paris Diderot (2014), undergraduate studies at the same institution. Research interests include CMB bispectrum analysis, B-mode polarization from primordial gravitational waves, and SN Ia standardization. He also investigates velocity fields and gravitational effects on cosmic structures through DESI data and CMB observations.

Research highlights include leading studies on CMB-S4 experiment design, analyzing BICEP/Keck data to constrain inflationary models, and co-authoring the ZTF SN Ia DR2 release. His current projects aim to refine peculiar velocity measurements with LSST and explore transient phenomena in LSST data.