Observational cosmology: My PhD research focused on the combination of cosmological probes including CMB lensing, galaxy clustering, weak lensing and the Lyman-α forest, and exploring how they can be used to 1) improve statistical constraints on the parameters of various cosmological models, 2) detect new signals and observables and 3) mitigate experimental systematics.
Statistical and numerical methods: I am also interested in exploring methods such as bayesian inference methods, deep learning techniques for galaxy survey images analysis and in developing new ways of data compression adapted to joint analyses.
Theoretical physics: I have interest in modified theories of gravity and their cosmological implications, as well as in loop quantum gravity.
First detection of cosmic microwave background lensing and Lyman-α forest bispectrum. Cyrille Doux, Emmanuel Schaan, Eric Aubourg, Ken Ganga, Khee-Gan Lee, David N. Spergel, Julien Tréguer. Physical Review D, 94, 103506. arXiv:1607.03625 (2016). We detected a correlation between the amplitude of the fluctuations in the Lyman-α forest and CMB lensing convergence along the same line of sight, a purely non-linear effect. A non-technical synopsis on APS’s Physics magazine came the publication of the article.
Cosmological constraints from a joint analysis of cosmic microwave background and spectroscopic tracers of the large-scale structure. Cyrille Doux, Mariana Penna-Lima, Sandro D. P. Vitenti, Julien Tréguer, Eric Aubourg and Ken Ganga. MNRAS 480, 5386–5411. arXiv:1706.04583 (2018). We develop a method based on pseudo-spectra to simultaneously analyze galaxy clustering, CMB lensing and CMB temperature fluctuations that includes cross-correlations and apply it to Planck and SDSS-III/BOSS data to constrain the wCDM model and the mass of neutrinos.