Local thermodynamical equilibrium and the equation of state of hot, dense matter created in Au+Au collisions at AGS

Local kinetic and chemical equilibration is studied for Au+Au collisions at 10.7 AGeV in the microscopic Ultrarelativistic Quantum Molecular Dynamics model (UrQMD). The UrQMD model exhibits dramatic deviations from equil
Local kinetic and chemical equilibration is studied for Au+Au collisions at 10.7 AGeV in the microscopic Ultrarelativistic Quantum Molecular Dynamics model (UrQMD). The UrQMD model exhibits dramatic deviations from equilibrium during the high density phase of the collision. Thermal and chemical equilibration of the hadronic matter seems to be established in the later stages during a quasiisentropic expansion, observed in the central reaction cell with volume 125 fm3. For t > 10 fm/c the hadron energy spectra in the cell are nicely reproduced by Boltzmann distributions with a common rapidly dropping temperature. Hadron yields change drastically and at the late expansion stage follow closely those of an ideal gas statistical model. The equation of state seems to be simple at late times: P = 0.12 Epsilon. The time evolution of other thermodynamical variables in the cell is also presented.
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Metadaten
Author:Larissa V. Bravina, Mark I. Gorenstein, Mohamed Belkacem, Steffen A. Bass, Marcus Bleicher, Mathias Brandstetter, M. Hofmann, Sven Soff, Christian Spieles, Henning Weber, Horst Stöcker, Walter Greiner
URN:urn:nbn:de:hebis:30-6886
Document Type:Preprint
Language:English
Date of Publication (online):2005/04/13
Year of first Publication:1998
Publishing Institution:Univ.-Bibliothek Frankfurt am Main
Release Date:2005/04/13
Tag:Monte-Carlo model for relativistic heavy ion collisions; Statistical model; equation of state; thermalization
Source:http://de.arxiv.org/abs/nucl-th/9804008 , Phys.Lett. B434 (1998) 379-387
HeBIS PPN:128746629
Institutes:Physik
Dewey Decimal Classification:530 Physik
PACS-Classification:24.10.Lx Monte Carlo simulations (including hadron and parton cascades and string breaking models)
24.10.Pa Thermal and statistical models
Sammlungen:Universitätspublikationen
Licence (German):License Logo Veröffentlichungsvertrag für Publikationen

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