TY  - JOUR
AU  - Giusarma, E.
AU  - Di Valentino, E.
AU  - Lattanzi, M.
AU  - Melchiorri, A.
AU  - Mena, O.
PY  - 2014
DA  - 2014//
TI  - Relic neutrinos, thermal axions, and cosmology in early 2014
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 043507
EP  - 17pp
VL  - 90
IS  - 4
PB  - Amer Physical Soc
AB  - We present up-to-date cosmological bounds on the sum of active neutrino masses as well as on extended cosmological scenarios with additional thermal relics, as thermal axions or sterile neutrino species. Our analyses consider all the current available cosmological data in the beginning of year 2014, including the very recent and most precise baryon acoustic oscillation measurements from the Baryon Oscillation Spectroscopic Survey. In the minimal three-active-neutrino scenario, we find Sigma m(nu) < 0.22 eV at 95% C.L. from the combination of cosmic microwave background (CMB), baryon acoustic oscillation, and Hubble Space Telescope measurements of the Hubble constant. A nonzero value for the sum of the three active neutrino masses of similar to 0.3 eV is significantly favored at more than three standard deviations when adding the constraints on s 8 and Om from the Planck cluster catalog on galaxy number counts. This preference for nonzero thermal relic masses disappears almost completely in both the thermal axion and massive sterile neutrino schemes. Extra light species contribute to the effective number of relativistic degrees of freedom, parametrized via N-eff. We found that when the recent detection of B mode polarization from the BICEP2 experiment is considered, an analysis of the combined CMB data in the framework of LCDM + r models gives N-eff = 3.90 +/- 0.42, suggesting the presence of an extra relativistic relic at more than 95% C.L. from CMB-only data.
SN  - 1550-7998
UR  - http://arxiv.org/abs/1403.4852
UR  - https://doi.org/10.1103/PhysRevD.90.043507
DO  - 10.1103/PhysRevD.90.043507
LA  - English
N1  - WOS:000347985100004
ID  - Giusarma_etal2014
ER  -