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Consequences of kinetic non-equilibrium for the nuclear equation-of-state in heavy ion collision

C. Fuchs·T. Gaitanos
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Abstract

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.

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C. Fuchs, T. Gaitanos. 2002-12-16. Consequences of kinetic non-equilibrium for the nuclear equation-of-state in heavy ion collision. https://doi.org/10.1016/s0375-9474(02)01399-4

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