TY  - INPR
A1  - Bravina, Larissa
A1  - Zabrodin, Eugene E.
A1  - Gorenstein, Mark I.
A1  - Bass, Steffen A.
A1  - Belkacem, Mohamed
A1  - Bleicher, Marcus
A1  - Brandstetter, Mathias
A1  - Ernst, Christoph
A1  - Fäßler, Amand
A1  - Greiner, Walter
A1  - Soff, Sven
A1  - Stöcker, Horst
A1  - Weber, Henning
T1  - Equilibrium and non-equilibrium effects in relativistic heavy ion collisions
T2  - talk at Quark Matter '99, Torino, Italy, May 10-14, 1999
N2  - The hypothesis of local equilibrium (LE) in relativistic heavy ion collisions at energies from AGS to RHIC is checked in the microscopic transport model. We find that kinetic, thermal, and chemical equilibration of the expanding hadronic matter is nearly reached in central collisions at AGS energy for t >_ fm/c in a central cell. At these times the equation of state may be approximated by a simple dependence P ~= (0.12-0.15) epsilon. Increasing deviations of the yields and the energy spectra of hadrons from statistical model values are observed for increasing bombarding energies. The origin of these deviations is traced to the irreversible multiparticle decays of strings and many-body (N >_ 3) decays of resonances. The violations of LE indicate that the matter in the cell reaches a steady state instead of idealized equilibrium. The entropy density in the cell is only about 6% smaller than that of the equilibrium state.
Y1  - 1999
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/4788
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30-7085
UR  - http://de.arxiv.org/abs/nucl-th/9907062
ER  -