The first second of leptons

Stuke M (2011)
Bielefeld (Germany): Bielefeld University.

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Bielefeld Dissertation | English
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Schwarz, Dominik J.
Abstract
We study the influence of lepton asymmetries on the evolution of the early Universe. The lepton asymmetry l is poorly constrained by observations and might be orders of magnitudes larger than the observed baryon asymmetry b~O(10^{-10}), |l|/b~O(10^9). We find that lepton asymmetries 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. For tiny or vanishing baryon and lepton asymmetries lattice QCD simulations show that the cosmic QCD transition is a rapid crossover. However, for large lepton asymmetry, the order of the cosmic transition remains unknown. We find that a large asymmetry in one or more lepton flavour changes the number of helicity degrees of freedom of all particles in equilibrium g_{ast} significantly. For the relic abundance of WIMPs, depending on g_{ast} of all particles at the freeze out temperature 40 GeV > T_fo > 0.4 GeV we find a decreasing of few percent depending on l_f . For an asymmetry of l_f = 0.1 in all three flavour we find a decrease of the relic WIMP abundance for a given freeze out temperature of almost 20 percent.
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Cite this

Stuke M. The first second of leptons. Bielefeld (Germany): Bielefeld University; 2011.
Stuke, M. (2011). The first second of leptons. Bielefeld (Germany): Bielefeld University.
Stuke, M. (2011). The first second of leptons. Bielefeld (Germany): Bielefeld University.
Stuke, M., 2011. The first second of leptons, Bielefeld (Germany): Bielefeld University.
M. Stuke, The first second of leptons, Bielefeld (Germany): Bielefeld University, 2011.
Stuke, M.: The first second of leptons. Bielefeld University, Bielefeld (Germany) (2011).
Stuke, Maik. The first second of leptons. Bielefeld (Germany): Bielefeld University, 2011.
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