TY  - JOUR
AU  - Giare, W.
AU  - Di Valentino, E.
AU  - Melchiorri, A.
AU  - Mena, O.
PY  - 2021
DA  - 2021//
TI  - New cosmological bounds on hot relics: axions and neutrinos
T2  - Mon. Not. Roy. Astron. Soc.
JO  - Monthly Notices of the Royal Astronomical Society
SP  - 2703
EP  - 2711
VL  - 505
IS  - 2
PB  - Oxford Univ Press
KW  - cosmic background radiation
KW  - cosmological parameters
KW  - dark matter
KW  - early Universe
KW  - cosmology: observations
AB  - Axions, if realized in nature, can be copiously produced in the early universe via thermal processes, contributing to the mass-energy density of thermal hot relics. In light of the most recent cosmological observations, we analyse two different thermal processes within a realistic mixed hot dark matter scenario which includes also massive neutrinos. Considering the axion-gluon thermalization channel, we derive our most constraining bounds on the hot relic masses m(a) < 7.46 eV and Sigma m(nu) < 0.114 eV both at 95 percent CL; while studying the axion-pion scattering, without assuming any specific model for the axion-pion interactions, and remaining in the range of validity of the chiral perturbation theory, our most constraining bounds are improved to m(a) < 0.91 eV and Sigma m(nu) < 0.105 eV, both at 95 percent CL. Interestingly, in both cases, the total neutrino mass lies very close to the inverted neutrino mass ordering prediction. If future terrestrial double beta decay and/or long-baseline neutrino experiments find that the nature mass ordering is the inverted one, this could rule out a wide region in the currently allowed thermal axion window. Our results therefore, strongly support multi messenger searches of axions and neutrino properties, together with joint analyses of their expected sensitivities.
SN  - 0035-8711
UR  - https://arxiv.org/abs/2011.14704
UR  - https://doi.org/10.1093/mnras/stab1442
DO  - 10.1093/mnras/stab1442
LA  - English
N1  - WOS:000672803400085
ID  - Giare_etal2021
ER  -