The quark gluon plasma equation of state and the expansion of the early Universe
arXiv:1410.3893 · doi:10.1016/j.nuclphysa.2015.02.004
Abstract
Our knowledge of the equation of state of the quark gluon plasma has been continuously growing due to the experimental results from heavy ion collisions, due to recent astrophysical measurements and also due to the advances in lattice QCD calculations. The new findings about this state may have consequences on the time evolution of the early Universe, which can estimated by solving the Friedmann equations. The solutions of these equations give the time evolution of the energy density and also of the temperature in the beginning of the Universe. In this work we compute the time evolution of the QGP in the early Universe, comparing several equations of state, some of them based on the MIT bag model (and on its variants) and some of them based on lattice QCD calculations. Among other things, we investigate the effects of a finite baryon chemical potential in the evolution of the early Universe.
References in corpus (10)
- Shapiro delay measurement of a two solar mass neutron star
- The order of the quantum chromodynamics transition predicted by the standard model of particle physics
- The QCD equation of state with dynamical quarks
- Phase transitions in the early and the present Universe
- Effective Theory of Wilson Lines and Deconfinement
- Imprints of the QCD Phase Transition on the Spectrum of Gravitational Waves
- The Cosmological QCD Phase Transition Revisited
- Analytical study of a gas of gluonic quasiparticles at high temperature: effective mass, pressure and trace anomaly
- Modified Bag Models for the Quark Gluon Plasma Equation of State
- The realistic QCD equation of state in relativistic heavy-ion collisions and the early Universe