WIMP abundance and lepton (flavour) asymmetry

Abstract

We investigate how large lepton asymmetries affect the evolution of the early universe at times before big bang nucleosynthesis and in particular how they influence the relic density of WIMP dark matter. In comparison to the standard calculation of the relic WIMP abundance we find a decrease, depending on the lepton flavour asymmetry. We find an effect of up to 20 per cent for lepton flavour asymmetries $l_f=\mathcal{O}(0.1)$.

16 pages, 4 figures; v2:minor changes to some wordings

References in corpus (8)

• The Atacama Cosmology Telescope: Cosmological Parameters from the 2008 Power Spectra
• Phase transitions in the early and the present Universe
• Updated BBN bounds on the cosmological lepton asymmetry for non-zero theta13
• Relic density of neutrinos with primordial asymmetries
• Constraining The Universal Lepton Asymmetry
• Constraints on the Very Early Universe from Thermal WIMP Dark Matter
• WMAP 5-year constraints on lepton asymmetry and radiation energy density: Implications for Planck
• Particle asymmetries in the early universe

Cited by in corpus (12)

• In the Realm of the Hubble tension $-$ a Review of Solutions
• Observational Evidence for Primordial Black Holes: A Positivist Perspective
• Cosmological lepton asymmetry with a nonzero mixing angle θ_{13}
• Improved constraints on lepton asymmetry from the cosmic microwave background
• Pion condensation in the early Universe at nonvanishing lepton flavor asymmetry and its gravitational wave signatures
• Flavor versus mass eigenstates in neutrino asymmetries: implications for cosmology
• Lepton Flavour Asymmetries and the Mass Spectrum of Primordial Black Holes
• Effects of the QCD Equation of State and Lepton Asymmetry on Primordial Gravitational Waves
• Forecast on lepton asymmetry from future CMB experiments
• Lepton Flavor Asymmetries: from the early Universe to BBN
• Fermi-Boltzmann statistics of neutrinos and relativistic effective degrees of freedom
• Relativistic effective degrees of freedom and quantum statistics of neutrinos