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Dec 13 – 18, 2015
International Conference Centre Geneva
Europe/Zurich timezone

Joint constraints on neutrino mass and number of effective neutrino species from cosmology

Dec 15, 2015, 6:43 PM
Level -1, Room 16 (International Conference Centre Geneva)

Level -1, Room 16

International Conference Centre Geneva

17 Rue de Varembé, 1211 Geneva


Graziano Rossi (Sejong University)


We present joint constraints on the number of effective neutrino species Neff and the sum of neutrino masses, using a technique based on state-of-the-art hydrodynamical simulations with massive neutrinos, which allows one to exploit the full information contained in the one-dimensional Lyman-Alpha forest flux power spectrum complemented by additional cosmological probes. Our results provide strong evidence for the cosmic neutrino background (Neff = 0 is rejected at more than 14σ), and rule out the possibility of a sterile neutrino thermalized with active neutrinos at a significance of over 5σ – one of the strongest bounds to date.

Primary author

Graziano Rossi (Sejong University)


Presentation materials