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.
Highlights
The excess of matter over antimatter in the Universe is one of the major puzzles of particle physics and cosmology
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
Summary
The excess of matter over antimatter in the Universe is one of the major puzzles of particle physics and cosmology. We investigate how a lepton asymmetry impacts the cosmic trajectory in the QCD phase diagram. We present a novel technique of determining the evolution of chemical potentials for arbitrary lepton asymmetries throughout the QCD epoch by using lattice QCD susceptibilities.
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