Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...452..501g&link_type=abstract
Astrophysical Journal v.452, p.501
Astronomy and Astrophysics
Astronomy
3
Cosmology: Early Universe, Elementary Particles, Nuclear Reactions, Nucleosynthesis, Abundances
Scientific paper
We study the baryon density contrast between the quark-gluon and hadron phases during the deconfinement phase transition in the early universe. The quark-gluon phase is treated perturbatively to order g2 in the quantum-chromodynamics (QCD) coupling constant and by keeping the finite masses for the s and c quarks. In the hadronic phase we have included the finite size volume corrections for the hadrons and have accounted for repulsive interaction by parameterizing the mean field potential energy. We have also considered an exponential mass spectrum with hard-core repulsive potential of the Hagedorn type for the hadron gas and find that the repulsive mean field potential, with or without excluded volume correction, seems to stabilize the pressure and baryon density contrast R when compared to only the excluded volume correction.
Anand J. D.
Goyal Ashok
Gupta Vijay K.
Pathak Saurav
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