2018/10/31 by Alexander Bonilla, Rafael C. Nunes, Éverton M. C. Abreu +1
Physics and Astronomy · #Anisotropy #Astrophysics #Asymmetry #Black Holes and Theoretical Physics #Context (archaeology) #Cosmic microwave background #Cosmology and Gravitation Theories #Degeneracy (biology) #Lepton #Neutrino #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum mechanics #astro-ph.CO #gr-qc #hep-ph
paper · pdf · doi:10.1093/mnras/stz524
published as MNRAS 485, 2486-2491 (2019) · 6 pages, 2 figures, 2 tables. Matches the version published in MNRAS
openalex publication_date 2019/02/25 · arxiv created 2019/03/25 · arxiv updated 2019/03/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We consider a cosmological lepton asymmetry in the form of neutrinos and impose new expected sensitivities on such asymmetry through the degeneracy parameter (ξν) by using some future CMB experiment configurations, such as CORE and CMB-S4. Taking the default scenario with three neutrino states, we find |ξ μ = 0.05 ± 0.10 (± 0.04)|, from CORE (CMB-S4) at 95 per cent CL, respectively. Also, within this scenario, we evaluate the neutrino mass scale, obtaining that the normal hierarchy mass scheme is privileged. Our results are an update concerning on the cosmological lepton asymmetry and the neutrino mass scale within this context, from which can bring a perspective on the null hypothesis for ξν (and its effects on ΔNeff), where perhaps, ξν may take a non-null value up to 95 per cent CL from future experiments such as CMB-S4. Sensitivity results for CMB-S4 obtained here not including all expected systematic errors.