QCD Equation of State and Cosmological Parameters in Early Universe

Abstract

The time evolution of cosmological parameters in early Universe at the deconfinement transition is studied by an equation of state (EoS) which takes into account the finite baryon density and the background magnetic field. The non perturbative dynamics is described by the Field Correlator Method (FCM) which gives, with a small number of free parameters, a good fit of lattice data. The entire system has two components, i.e. the quark-gluon plasma and the electroweak sector, and the solutions of the Friedmann equation show that the scale factor, $a(t)$, and $H(t)=(1/a)da/dt$ are weakly dependent on the EoS, but the deceleration parameter, $q(t)$, and the jerk, $j(t)$, are strongly modified above the critical temperature $T_c$, corresponding to a critical time $t_c\simeq 20-25\mu s$. The time evolution of the cosmological parameters suggest that above and around $T_c$ there is a transient state of acceleration typical of a matter dominated Universe; this is entailed by the QCD strong interaction driven by the presence of massive colored objects.

References in corpus (17)

• The order of the quantum chromodynamics transition predicted by the standard model of particle physics
• The equation of state in (2+1)-flavor QCD
• The QCD equation of state in background magnetic fields
• Phase transitions in the early and the present Universe
• Constraining and applying a generic high-density equation of state
• Initial condition for hydrodynamics, partonic free streaming, and the uniform description of soft observables at RHIC
• Cosmic Jerk, Snap and Beyond
• Vacuum phase transition at nonzero baryon density
• Effective degrees of freedom and gluon condensation in the high temperature deconfined phase
• The Cosmological QCD Phase Transition Revisited
• Deconfinement transition for nonzero baryon density in the Field Correlator Method
• Gravity waves generated by sounds from big bang phase transitions
• The quark gluon plasma equation of state and the expansion of the early Universe
• Astrophysical constraints on the confining models : the Field Correlator Method
• The realistic QCD equation of state in relativistic heavy-ion collisions and the early Universe
• Cosmology In Terms Of The Deceleration Parameter. Part II
• Cosmology In Terms Of The Deceleration Parameter. Part I

Cited by in corpus (7)

• Charmed Hadrons from Coalescence plus Fragmentation in relativistic nucleus-nucleus collisions at RHIC and LHC
• Effective description of hot QCD medium in strong magnetic field and longitudinal conductivity
• Towards the understanding of heavy quarks hadronization: from leptonic to heavy-ion collisions
• Finite temperature QCD four-point function in the presence of a weak magnetic field within the hard thermal loop approximation
• Deconfinement Transition Effects on Cosmological Parameters and Primordial Gravitational Wave Spectrum
• Cosmology from Strong Interactions
• On the anomalous mass defect of strange stars in the Field Correlator Method