Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2002-11-28
Nucl.Phys. A714 (2003) 643-670
Physics
Nuclear Physics
Nuclear Theory
41 pages, 13 figures, to appear in Nucl. Phys. A
Scientific paper
10.1016/S0375-9474(02)01399-4
Highly compressed nuclear matter created in relativistic heavy collisions is to large extent governed by local non-equilibrium. As an idealized scenario colliding nuclear matter configurations are studied within both, relativistic mean field theory and using more realistic in-medium interactions based on the Dirac-Brueckner T-matrix. The equation of state in anisotropic matter is thereby governed by two competing effects: The enlarged phase space volume in colliding matter tends to soften the internal potential energy of the subsystems whereas the relative motion of the two currents leads to a strong additional repulsion in the system. An effective EOS constructed for anisotropic momentum configurations shows a significant net softening compared to ground state nuclear matter. This effect is found to be to large extend independent on the particular choice of the nuclear interaction. A critical discussion of standard transport approaches with respect to the considered non-equilibrium effects is given.
Fuchs Ch.
Gaitanos Theodoros
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