Cosmological evidence for leptonic asymmetry after Planck

Abstract

Recently, the Planck satellite found a larger and most precise value of the matter energy density, that impacts on the present values of other cosmological parameters such as the Hubble constant, the present cluster abundances and the age of the Universe. The existing tension between Planck determination of these parameters in the frame of the base LambdaCDM model and their direct measurements generated lively discussions and several interpretations. In this paper we quantify this tension by exploring several extensions of the base LambdaCDM model that include the leptonic asymmetry. We set bounds on the radiation content of the Universe and neutrino properties by using the latest cosmological measurements, imposing also self-consistent BBN constraints on the primordial helium abundance. For all cosmological asymmetric models we find the preference of cosmological data for smaller values of active and sterile neutrino masses. This increases the tension between cosmological and short baseline neutrino oscillation data that favor a sterile neutrino with the mass of around 1 eV. For the case of degenerate massive neutrinos, we find that the discrepancies with direct determinations of the Hubble constant, the present cluster abundances and the age of the Universe are alleviated at ~ 1.3 sigma for all leptonic asymmetric models. We also find ~2 sigma statistical evidence of the preference of cosmological data for the normal neutrino hierarchy. This is more evident for the case of cosmological models involving leptonic asymmetry and three massive neutrino species. We conclude that the current cosmological data favor the leptonic asymmetric extension of the base LambdaCDM model and normal neutrino mass hierarchy over the models with additional sterile neutrino species and/or inverted neutrino mass hierarchy.

18 pages, 7 figures, submitted to Journal of Cosmology and Astroparticle Physics

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• Quantifying the $S_8$ tension and evidence for interacting dark energy from redshift-space distortion measurements
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• Flavor versus mass eigenstates in neutrino asymmetries: implications for cosmology
• Detection prospects for the Cosmic Neutrino Background using laser interferometers
• Sign Switching in Dark Sector Coupling Interactions as a Candidate for Resolving Cosmological Tensions
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• Hubble tension in lepton asymmetric cosmology with an extra radiation
• Forecast on lepton asymmetry from future CMB experiments
• Probing a panoply of curvaton-decay scenarios using CMB data
• Baryogenesis through Asymmetric Hawking Radiation from Primordial Black Holes as Dark Matter
• Probing Lepton Asymmetry with 21 cm Fluctuations
• Comparison of results on $N_{\mathrm{eff}}$ from various Planck likelihoods
• Constraints on the Helium Abundance from Fast Radio Bursts
• Subdominant Dark Matter sterile neutrino resonant production in the light of Planck
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