Lepton asymmetry and the cosmic QCD transition

Details Lepton asymmetry and the cosmic QCD transition Lepton asymmetry and the cosmic QCD transition

2009-06-18

arxiv.org/abs/0906.3434v4

JCAP 0911:025,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, 14 figures; matches published version, including Erratum. Conclusions, pictures, numerics remained unchanged

Scientific paper

10.1088/1475-7516/2009/11/025

We study the influence of lepton asymmetry on the evolution of the early Universe. The lepton asymmetry $l$ is poorly constrained by observations and might be orders of magnitude larger than the baryon asymmetry $b$, $|l|/b \leq 2\times 10^8$. We find that lepton asymmetries that are large compared to the tiny baryon asymmetry, can influence the dynamics of the QCD phase transition significantly. The cosmic trajectory in the $\mu_B-T$ phase diagram of strongly interacting matter becomes a function of lepton (flavour) asymmetry. Large lepton asymmetry could lead to a cosmic QCD phase transition of first order.

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