Dr Mathieu Remazeilles

Research Fellow

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Overview

My research revolves around the extraction and interpretation of new cosmological observables and information that can be gleaned from submillimetre and radio observations of the early Universe, primarily out of Cosmic Microwave Background (CMB) data.

Much of cosmological information about the early Universe is obscured by astrophysical foreground emissions in the nearby Universe. This is known as the "component separation" problem in cosmology. I have devised several major component separation methods in cosmology to disentangle the most elusive cosmological signals from the astrophysical foreground emissions, e.g. the "Constrained ILC" and GNILC algorithms, which have become standard references in the community for the analysis of various CMB and radio data including those of the ESA's Planck satellite mission. I have produced and released several public maps in Astronomy: the Planck map of thermal Sunyaez-Zeldovich effect, the Planck maps of cosmic infrared background anisotropies, the Planck maps of Galactic dust emission, the Reprocessed Haslam 408 MHz all-sky map, which are all used worldwide and form an important part of the Planck legacy.

My current research interests include the search for primordial CMB B-modes, as the footprint of primordial gravitational waves from the cosmic inflation epoch, a fraction of a second after the Big Bang; the mapping of thermal, kinetic, and relativistic Sunyaev-Zeldovich effects to probe baryonic and dark matter from galaxy clusters; the search for tiny CMB spectral distortions caused by various CMB-matter interactions at pre-recombination epochs; and the imprint of baryon acoustic oscillations in the cosmological 21-cm line emission due to hydrogen abundance in the Universe. I am involved in several upcoming and exciting world-leading CMB and radio experiments including LiteBIRD, Simons Observatory, PICO, CMB-S4, BISOU, and BINGO, which aim at shedding light on these elusive components of the Universe.

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