Quark-gluon plasma as the possible source of cosmological dark radiation

Jeremiah Birrell; Johann Rafelski

doi:10.1016/j.physletb.2014.12.033

Quark-gluon plasma as the possible source of cosmological dark radiation

Jeremiah Birrell
, Johann Rafelski

Physics

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

The effective number of neutrinos, N_eff, 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 N_eff 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 N_eff and the QGP transformation for laboratory studies of QGP.

Original language	English (US)
Pages (from-to)	77-81
Number of pages	5
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	741
DOIs	https://doi.org/10.1016/j.physletb.2014.12.033
State	Published - Feb 4 2015

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/j.physletb.2014.12.033

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title = "Quark-gluon plasma as the possible source of cosmological dark radiation",

abstract = "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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AU - Birrell, Jeremiah

AU - Rafelski, Johann

PY - 2015/2/4

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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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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 -

Quark-gluon plasma as the possible source of cosmological dark radiation

Abstract

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