Cosmic QCD Epoch at Nonvanishing Lepton Asymmetry
High Energy Physics - Phenomenology
2018-11-20 v2 Cosmology and Nongalactic Astrophysics
High Energy Physics - Lattice
Abstract
We investigate how a lepton asymmetry impacts the cosmic trajectory in the QCD phase diagram. We study the evolution of chemical potentials during the QCD epoch of the early Universe using susceptibilities from lattice QCD to interpolate between an ideal quark gas and an ideal hadron resonance gas. The lepton asymmetry affects the evolution of all chemical potentials. The standard cosmic trajectory is obtained assuming tiny lepton and baryon asymmetries. For larger lepton asymmetry, the charge chemical potential exceeds the baryon chemical potential before pion annihilation.
Cite
@article{arxiv.1807.10815,
title = {Cosmic QCD Epoch at Nonvanishing Lepton Asymmetry},
author = {Mandy M. Wygas and Isabel M. Oldengott and Dietrich Bodeker and Dominik J. Schwarz},
journal= {arXiv preprint arXiv:1807.10815},
year = {2018}
}
Comments
6 pages, 2 figures; v2: published version (including minor additional remarks and references)