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Benjamin Beringue

Mr Benjamin Beringue

Research Associate
Astronomy Instrumentation Group
Cardiff Hub for Astrophysics Research and Technology

School of Physics and Astronomy

Queen's Buildings - North Building, Room N/3.20A, 5 The Parade, Newport Road, Cardiff, CF24 3AA


I am a cosmologist, observing the Cosmic Microwave Background to constrain the origin and evolution of our Universe.

I joined the University of Cardiff as a Postdoctorate Research Associate in 2021. I am also a member of the Atacama Cosmology Telescope, Simons Observatory and CCAT-prime collaborations.





I am interested in various aspects of Cosmic Microwave Background cosmology. Examples include:

Rayleigh scattering of the Cosmic Microwave Background

The Cosmic Microwave Background (CMB) was emitted around redshift 1100 after recombination between free electrons and protons in the primordial plasma took place. Until then, CMB photons were tightly coupled to the plasma thanks to Thomson scattering off free electrons. As free electrons start to recombine with protons, this scattering process becomes less and less efficient. However, recombination also yields neutral species, mainly Hydrogen and Helium by which CMB photons can also be scattered : this is Rayleigh scattering.

Component separation for the Simons Observatory

Component separation refers to the complex problem of disentangling signals of interest in a noisy mixture. Observations of the CMB are spoiled by emissions with various astrophysical origins in the same frequency bands. Examples for such emissions include : dust and synchrotron radiations from our galaxy, extragalactic emissions arising from the large background of radio and infrared galaxies and clusters, etc ... Our ability to constrain cosmological parameters directly depends on how efficiently these foregrounds can be removed.



  • 2019-2021 : Supervision of Part III Cosmology, taught by Prof. Blake Sherwin - University of Cambridge


Carroll Overview

  • 2021 - date : Postdoctorate Research Associate at Cardiff University


  • 2017 - 2021 : PhD in Applied Mathematics and Theoretical Physics at the University of Cambridge. Supervised by Prof. Daan Meerburg.
  • 2016 - 2017 : Master of Advanced Studies (Part III) at the University of Cambridge.
  • 2013 - 2016 : Diplôme d'Ingénieur from the Institut d'Optique Graduate School. In parallel, MSc in Large Scale Research Facilities (High power lasers, particle accelerators, tokamaks) from Paris Saclay University.
  • 2011 - 2013 : Classe préparatoires aux Grandes Écoles , Lycée Fabert, France.