Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 65: Heavy Ion Collisions and QCD Phases 9
HK 65.3: Vortrag
Donnerstag, 26. März 2015, 17:30–17:45, T/SR14
Phasespace dynamics of strongly interacting bose systems — •Eduard Seifert — Institut für Theoretische Physik, Gießen, Deutschland
The equilibration of many-body systems far out-off equilibrium has always been a major topic of research. With increasing calculational power more complicated systems can be studied numerically in acceptable time. A complete off-shell transport approach based on the detailed balance relation is used to simulate a spatially homogeneous system of scalar bosons in the φ4-theory in two spatial dimensions including bose-enhancement factors. The scalar φ4-theory is chosen as the interacting theory because of its simplicity and comparability to known solutions of the Kadanoff-Baym equations (KBE) for spatially homogenous systems. The transport equation is solved within a finite box with periodic boundary conditions employing an off-shell test particle ansatz with relativistic Breit-Wigner spectral functions. Three stages of equilibration (kinetic, spectral and chemical equilibration) are studied for different initial momentum distributions, particle densities and coupling strengths. The transport approach propagates the system for moderate coupling strengths comparably to the KBE solutions but deviates for strong coupling strengths.