• DOI:10.1088/1475-7516/2014/02/012
• Corpus ID: 118474952

Cosmological evidence for leptonic asymmetry after Planck

@article{Caramete2013CosmologicalEF,
  title={Cosmological evidence for leptonic asymmetry after Planck},
  author={Ana Caramete and Lucia Aurelia Popa},
  journal={Journal of Cosmology and Astroparticle Physics},
  year={2013},
  volume={2014},
  pages={012 - 012}
}

• A. Caramete, L. Popa
• Published 15 November 2013
• Physics
• Journal of Cosmology and Astroparticle Physics

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 H0, the present cluster abundances S8, and the age of the Universe tU. The existing tension between PLANCK determination of these parameters in the frame of the base ΛCDM model and their determination from other measurements generated lively discussions, one possible interpretation being that some sources of systematic errors in cosmological measurements are not completely understood. An alternative interpretation is related to the fact that the CMB observations, that probe the high redshift Universe are interpreted in terms of cosmological parameters at present time by extrapolation within the base ΛCDM model that can be inadequate or incomplete. In this paper we quantify this tension by exploring several extensions of the base ΛCDM 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 asymmetric cosmological 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 favors a sterile neutrino with the mass of around 1 eV. For the case of degenerate massive neutrinos, we find that the discrepancies with the local determinations of H0, and tU are alleviated at ∼ 1.3σ level while S8 is in agreement with its determination from CFHTLenS survey data at ∼ 1σ and with the prediction of cluster mass-observation relation at ∼ 0.5σ. We also find 2σ statistical preference of the cosmological data for the leptonic asymmetric models involving three massive neutrino species and neutrino direct mass hierarchy. We conclude that the current cosmological data favor the leptonic asymmetric extension of the base ΛCDM model and normal neutrino mass hierarchy over the models with additional sterile neutrino species and/or inverted neutrino mass hierarchy.