Dynamical Evolution of the Scalar Condensate in Heavy Ion Collisions

Details Dynamical Evolution of the Scalar Condensate in Heavy Ion Collisions Dynamical Evolution of the Scalar Condensate in Heavy Ion Collisions

1999-08-04

arxiv.org/abs/nucl-th/9908020v2

Phys.Rev. C61 (2000) 054901

Physics

Nuclear Physics

Nuclear Theory

19 pages, 3 figures are embedded at the end. The effect of the time dependence of the condensate v is included in this revised

Scientific paper

10.1103/PhysRevC.61.054901

We derive the effective coarse-grained field equation for the scalar condensate of the linear sigma model in a simple and straightforward manner using linear response theory. The dissipative coefficient is calculated at tree level on the basis of the physical processes of sigma-meson decay and of thermal sigma-mesons and pions knocking sigma-mesons out of the condensate. The field equation is solved for hot matter undergoing either one or three dimensional expansion and cooling in the aftermath of a high energy nuclear collision. The results show that the time constant for returning the scalar condensate to thermal equilibrium is of order 2 fm/c.

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