Particle asymmetries in the early universe

Abstract

The total lepton asymmetry $l={\sum }_f{l}_f$ in our universe is only poorly constrained by theories and experiments. It might be orders of magnitudes larger than the observed baryon asymmetry $b\simeq \mathcal{O}(10^{-10})$, $|l|/b\le \mathcal{O}(10^9)$. We found that the dynamics of the cosmic QCD transition changes for large asymmetries. Predictions for asymmetries in a single flavour $l_f$ allow even larger values. We find that asymmetries of $l_f\le \mathcal{O}(1)$ in a single or two flavours change the relic abundance of WIMPs. However, large lepton and large individual lepton flavour asymmetries influences significantly the dynamics of the early universe.

7 pages,8 figures; Proceedings of the Erice workshop on Nuclear Physics 2010 "Particle and Nuclear Astrophysics"

References in corpus (6)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Relic density of neutrinos with primordial asymmetries
• Constraining The Universal Lepton Asymmetry
• Status of Lattice Studies of the QCD Phase Diagram
• WMAP 5-year constraints on lepton asymmetry and radiation energy density: Implications for Planck
• Cosmological Structure Formation Creates Large-Scale Magnetic Fields