Physical effects involved in the measurements of neutrino masses with future cosmological data

• Published in: Journal of cosmology and astroparticle physics Vol. 2017; no. 2; p. 52
• Main Authors: Archidiacono, Maria, Brinckmann, Thejs, Lesgourgues, Julien, Poulin, Vivian
• Format: Journal Article
• Language: English
• Published: United States Institute of Physics (IOP) 28.02.2017
• Subjects: ACCURACY; ASTROPHYSICS; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMOLOGICAL MODELS; Cosmology and Extra-Galactic Astrophysics; GALAXIES; MASS; MEV RANGE; NEUTRINOS; Physics; RED SHIFT; RELICT RADIATION; SENSITIVITY
• ISSN: 1475-7516; 1475-7508; 1475-7516
• DOI: 10.1088/1475-7516/2017/02/052

Future Cosmic Microwave Background experiments together with upcoming galaxyand 21-cm surveys will provide extremely accurate measurements of differentcosmological observables located at different epochs of the cosmic history. Thenew data will be able to constrain the neutrino mass sum with the bestprecision ever. In order to exploit the complementarity of the differentredshift probes, a deep understanding of the physical effects driving theimpact of massive neutrinos on CMB and large scale structures is required. Thegoal of this work is to describe these effects, assuming a summed neutrino massclose to its minimum allowed value. We find that parameter degeneracies can beremoved by appropriate combinations, leading to robust and model independentconstraints. A joint forecast of the sensitivity of Euclid and DESI surveystogether with a CORE-like CMB experiment leads to a $1\sigma$ uncertainty of$14$~meV on the summed neutrino mass. However this particular combination givesrise to a peculiar degeneracy between $M_\nu$ and the optical depth atreionization. Independent constraints from 21-cm surveys can break thisdegeneracy and decrease the $1\sigma$ uncertainty down to $12$~meV.