TY - JOUR
T1 - Quark-gluon plasma as the possible source of cosmological dark radiation
AU - Birrell, Jeremiah
AU - Rafelski, Johann
N1 - Publisher Copyright:
© 2014 The Authors.
PY - 2015/2/4
Y1 - 2015/2/4
N2 - The effective number of neutrinos, Neff, obtained from CMB fluctuations accounts for all effectively massless degrees of freedom present in the Universe, including but not limited to the three known neutrinos. Using a lattice-QCD derived QGP equation of state, we constrain the observed range of Neff in terms of the freeze-out of unknown degrees of freedom near to quark-gluon hadronization. We explore limits on the coupling of these particles, applying methods of kinetic theory, and discuss the implications of a connection between Neff and the QGP transformation for laboratory studies of QGP.
AB - The effective number of neutrinos, Neff, obtained from CMB fluctuations accounts for all effectively massless degrees of freedom present in the Universe, including but not limited to the three known neutrinos. Using a lattice-QCD derived QGP equation of state, we constrain the observed range of Neff in terms of the freeze-out of unknown degrees of freedom near to quark-gluon hadronization. We explore limits on the coupling of these particles, applying methods of kinetic theory, and discuss the implications of a connection between Neff and the QGP transformation for laboratory studies of QGP.
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U2 - 10.1016/j.physletb.2014.12.033
DO - 10.1016/j.physletb.2014.12.033
M3 - Article
AN - SCOPUS:84919625051
SN - 0370-2693
VL - 741
SP - 77
EP - 81
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
ER -