Extracting the equation of state from a microscopic non-equilibrium model

Details Extracting the equation of state from a microscopic non-equilibrium model Extracting the equation of state from a microscopic non-equilibrium model

1996-06-17

arxiv.org/abs/nucl-th/9606030v1

Physics

Nuclear Physics

Nuclear Theory

Proceedings of the XIV International Conference on Particles and Nuclei (PANIC'96), 22-28 May 1996, Williamsburg, Virginia, US

Scientific paper

We study the thermodynamic properties of infinite nuclear matter with the Ultrarelativistic Quantum Molecular Dynamics (URQMD), a semiclassical transport model, running in a box with periodic boundary conditions. It appears that the energy density rises faster than $T^4$ at high temperatures of $T\approx 200-300$~MeV. This indicates an increase in the number of degrees of freedom. Moreover, We have calculated direct photon production in Pb+Pb collisions at 160~GeV/u within this model. The direct photon slope from the microscopic calculation equals that from a hydrodynamical calculation without a phase transition in the equation of state of the photon source.

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