Expansion and Hadronization of a Chirally Symmetric Quark--Meson Plasma

Details Expansion and Hadronization of a Chirally Symmetric Quark--Meson Plasma Expansion and Hadronization of a Chirally Symmetric Quark--Meson Plasma

1998-09-28

arxiv.org/abs/hep-ph/9809565v1

Nucl.Phys.A653:415-435,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

Scientific paper

10.1016/S0375-9474(99)00232-8

Using a chirally symmetric Lagrangian, which contains quarks as elementary degrees of freedom and mesons as bound states, we investigate the expansion and hadronization of a fireball, which initially contains only quarks and produces mesons by collisions. For this model, we study the time scales of expansion and thermal and chemical equilibration. We find that the expansion progresses relatively fast, leaving not necessarily enough time to establish thermal and chemical equilibrium. Mesons are produced in the bulk of the fireball rather than at a surface, at a temperature below the Mott temperature. Initial density fluctuations become amplified during the expansion. These observations challenge the applicability of hydrodynamical approaches to the expansion of a quark-gluon plasma.

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