Münster 2017 – wissenschaftliches Programm
T 42.1: Vortrag
Dienstag, 28. März 2017, 11:00–11:15, VSH 17
Evolution of Chemical Potentials at Large Lepton Asymmetries — •Mandy M. Wygas and Dietrich Bödeker — Universität Bielefeld, Deutschland
An important phase in the early universe is the quark-hadron transition. It is well established that the order of the transition depends on the baryon density, or equivalently on the baryonchemical potential µB. In the QCD phase diagram in the µB−T plane, the cosmic QCD transition is commonly assumed to take place at vanishing baryonchemical potential µB≈ 0. However, as the baryon chemical potential also depends on lepton flavour asymmetries, this is only valid for a total lepton asymmetry l of the order of the baryon asymmetry, | l|≈O(b). While the magnitude of the baryon asymmetry, b≃ 10−10, can be determined by observations, l is only poorly constrained by observations and might be orders of magnitude larger than b, | l| 10−2. Thus potentially large lepton flavour asymmetries induce a large µB.