Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-11-13
Phys.Rev. D67 (2003) 074009
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, no figures, minor changes, version to appear in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.67.074009
Baryon number inhomogeneities may be generated during the epoch when the baryon asymmetry of the universe is produced, e.g. at the electroweak phase transition. The regions with excess baryon number will have a lower temperature than the background temperature of the universe. Also the value of the quark hadron transition temperature $T_c$ will be different in these regions as compared to the background region. Since a first-order quark hadron transition is very susceptible to small changes in temperature, we investigate the effect of the presence of such baryonic lumps on the dynamics of quark-hadron transition. We find that the phase transition is delayed in these lumps for significant overdensities. Consequently, we argue that baryon concentration in these regions grows by the end of the transition. We briefly discuss some models which may give rise to such high overdensities at the onset of the quark-hadron transition.
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