New cosmological bounds on hot relics: Axions $\&$ Neutrinos

Abstract

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 analyze 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 $\sum m_{\nu }<0.114$ eV both at 95 per cent 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 $\sum m_{\nu }<0.105$ eV, both at 95 per cent 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.

9 pages, 3 figures. Version Published on MNRAS

References in corpus (23)

• The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
• Cosmic Distances Calibrated to 1% Precision with Gaia EDR3 Parallaxes and Hubble Space Telescope Photometry of 75 Milky Way Cepheids Confirm Tension with LambdaCDM
• The landscape of QCD axion models
• Cosmology Intertwined II: The Hubble Constant Tension
• Revisiting the bound on axion-photon coupling from Globular Clusters
• Relic neutrino decoupling with flavour oscillations revisited
• Towards a precision calculation of $N_{\mathrm{eff}}$ in the Standard Model II: Neutrino decoupling in the presence of flavour oscillations and finite-temperature QED
• Neutrino decoupling including flavour oscillations and primordial nucleosynthesis
• A precision calculation of relic neutrino decoupling
• Dark Energy Survey Year 1 Results: Multi-Probe Methodology and Simulated Likelihood Analyses
• A Telescope Search for Decaying Relic Axions
• Relic Neutrinos, thermal axions and cosmology in early 2014
• Cornering the axion with CP-violating interactions
• An improved cosmological bound on the thermal axion mass
• Bounds on light sterile neutrino mass and mixing from cosmology and laboratory searches
• Searching for Light in the Darkness: Bounds on ALP Dark Matter with the optical MUSE-Faint survey
• Cosmological constraints on neutrino plus axion hot dark matter
• Breakdown of chiral perturbation theory for the axion hot dark matter bound
• The DFSZ axion in the CMB
• Axion helioscopes as solar magnetometers
• Future cosmological sensitivity for hot dark matter axions
• Cosmological searches for the neutrino mass scale and mass ordering
• Robustness of cosmological axion mass limits

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