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Mathieu Remazeilles: Research

     I moved to IFCA in Spain as a CSIC Tenured Research Scientist (December 1st, 2021)

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As a Planck Scientist, I have been largely involved in the CMB data analysis and scientific exploitation of the ESA's Planck satellite mission. The Planck satellite, launched by ESA in May 2009, is dedicated to the measurement of the temperature and polarisation anisotropies of the cosmic microwave background (CMB) radiation, which encodes the initial conditions of our Universe. My main contribution is the development of new component separation methods to extract and characterise components of emission beyond the CMB only: thermal and kinetic Sunyaev-Zeldovich (SZ) effects, cosmic infrared background (CIB), Galactic foregrounds, CMB spectral distortions, CMB B-modes.

I have produced several of the Planck product maps, which are publicly available on this page.

I am now working on the preparation of future CMB experiments: The LiteBIRD satellite (CMB space mission selected by JAXA for a launch in 2028) and the Simons Observatory (whose survey starts in 2021). My research now focuses on teasing the most elusive observables of the Universe out of future CMB and radio data: primordial CMB B-modes; relativistic SZ effects; CMB spectral distortions; and cosmological 21-cm signal.

These new cosmological observables each carry on invaluable information on the most elusive epochs and contents of our Universe: the primordial gravitational waves of quantum origin from the cosmic inflation era, a fraction of a second after the Big Bang; the elusive dark matter shaping the large-scale structure of the Universe; the mysterious dark energy responsible for the late accelerated expansion of the Universe.

I have research interests in a broad range of topics in cosmology. My list of past/current research activities includes:-

• Search for CMB B-modes: 2211.14342; MNRAS (2021); JCAP (2018); MNRAS (2018); MNRAS (2016)
• Component separation: MNRAS (2021); MNRAS (2011a); MNRAS (2011b); MNRAS (2010)
• Cosmic infrared background: Planck int. results. XLVIII, A&A (2016)
• μ-type spectral distortions: MNRAS (2022); MNRAS (2018)
• Sunyaev-Zeldovich effects: 2305.10193; MNRAS (2020); MNRAS (2019); Phys.Rev.D (2018); Planck 2015 results. XXII, A&A (2016); Planck int. results. XIII, A&A (2014); MNRAS (2013)
• CMB lensing: Phys.Rev.D (2012)
• Galactic foregrounds: MNRAS (2015)
• 21-cm intensity mapping: A&A (2022); MNRAS (2018); MNRAS (2016)
• Extra-dimensions and cosmological perturbations: Phys.Rev.D (2009)

    For the full list of publications, click here.