dorsal/arxiv
View SchemaEquilibrium and non-equilibrium effects in relativistic heavy ion collisions
| Authors | L. V. Bravina, E. E. Zabrodin, M. I. Gorenstein, S. A. Bass, M. Belkacem, M. Bleicher, M. Brandstetter, C. Ernst, Amand Faessler, W. Greiner, S. Soff, H. Stoecker, H. Weber |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9907062 |
| URL | https://arxiv.org/abs/nucl-th/9907062 |
| DOI | 10.1016/S0375-9474(99)85097-0 |
| Journal | Nucl.Phys. A661 (1999) 600-603 |
Abstract
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 $t \geq 10$ fm/$c$ in a central cell. At these times the equation of state may be approximated by a simple dependence $P \cong (0.12-0.15) \epsilon$. 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 $(N \geq 3)$ 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.
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"abstract": "The hypothesis of local equilibrium (LE) in relativistic heavy ion collisions\nat energies from AGS to RHIC is checked in the microscopic transport model. We\nfind that kinetic, thermal, and chemical equilibration of the expanding\nhadronic matter is nearly reached in central collisions at AGS energy for $t\n\\geq 10$ fm/$c$ in a central cell. At these times the equation of state may be\napproximated by a simple dependence $P \\cong (0.12-0.15) \\epsilon$. Increasing\ndeviations of the yields and the energy spectra of hadrons from statistical\nmodel values are observed for increasing bombarding energies. The origin of\nthese deviations is traced to the irreversible multiparticle decays of strings\nand many-body $(N \\geq 3)$ decays of resonances. The violations of LE indicate\nthat the matter in the cell reaches a steady state instead of idealized\nequilibrium. The entropy density in the cell is only about 6% smaller than that\nof the equilibrium state.",
"arxiv_id": "nucl-th/9907062",
"authors": [
"L. V. Bravina",
"E. E. Zabrodin",
"M. I. Gorenstein",
"S. A. Bass",
"M. Belkacem",
"M. Bleicher",
"M. Brandstetter",
"C. Ernst",
"Amand Faessler",
"W. Greiner",
"S. Soff",
"H. Stoecker",
"H. Weber"
],
"categories": [
"nucl-th",
"hep-ph"
],
"doi": "10.1016/S0375-9474(99)85097-0",
"journal_ref": "Nucl.Phys. A661 (1999) 600-603",
"title": "Equilibrium and non-equilibrium effects in relativistic heavy ion collisions",
"url": "https://arxiv.org/abs/nucl-th/9907062"
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