Constraints on the lepton asymmetry from DESI DR2 BAO data

Abstract

It is important to explore the potential existence of lepton asymmetry in the neutrino sector. Conducting a joint analysis of DESI DR2 BAO data and \emph{Planck} 2018 CMB data, we obtain the upper limits on the neutrino degeneracy parameter, i.e., $\xi <0.56$ for the normal mass hierarchy while $\xi <0.62$ for the inverted mass hierarchy, at 95\% confidence level. Considering the influence of the dynamical dark energy, we find that these upper limits remain to be robust. This work may provide helpful implications for model buildings of the matter-antimatter asymmetry in the universe.

11 pages, 3 figures, 2 tables, to appear in the Physical Review D

References in corpus (21)

• Exploring the Expansion History of the Universe
• Accelerating Universes with Scaling Dark Matter
• The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes
• Planck 2018 results. V. CMB power spectra and likelihoods
• Conservative Constraints on Early Cosmology: an illustration of the Monte Python cosmological parameter inference code
• Neutrinos in cosmology
• Matter and Antimatter in the Universe
• Cosmological implications of a Relic Neutrino Asymmetry
• Neutrino cosmology after DESI: tightest mass upper limits, preference for the normal ordering, and tension with terrestrial observations
• Impacts of dark energy on weighing neutrinos: mass hierarchies considered
• Constraints on the neutrino mass and mass hierarchy from cosmological observations
• Indications for a Nonzero Lepton Asymmetry from Extremely Metal-Poor Galaxies
• Big Bang Nucleosynthesis and Lepton Number Asymmetry in the Universe
• Primordial lepton asymmetries in the precision cosmology era: Current status and future sensitivities from BBN and the CMB
• Flavor versus mass eigenstates in neutrino asymmetries: implications for cosmology
• Updating non-standard neutrinos properties with Planck-CMB data and full-shape analysis of BOSS and eBOSS galaxies
• A new constraint on primordial lepton flavour asymmetries
• Forecast on lepton asymmetry from future CMB experiments
• Cosmology with the Square Kilometre Array by SKA-Japan
• Relic Neutrino Degeneracies and Their Impact on Cosmological Parameters
• Probing Lepton Asymmetry with 21 cm Fluctuations

Cited by in corpus (1)

• Measuring neutrino mass in light of ACT DR6 and DESI DR2