Thermal, chemical and spectral equilibration in heavy-ion collisions

Almási, Gábor András and Wolf, György (2015) Thermal, chemical and spectral equilibration in heavy-ion collisions. NUCLEAR PHYSICS A, 943. pp. 117-136. ISSN 0375-9474

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Abstract

We have considered the equilibration in relativistic heavy ion collisions at energies 1-7 AGeV using our transport model. We applied periodic bound- ary conditions to close the system in a box. We found that the thermal equilibration takes place in the first 20-40 fm/c which time is comparable to the duration of a heavy ion collision. The chemical equilibration is a much slower process and the system does not equilibrate in a heavy ion collision. We have shown that in the testparticle simulation of the Boltzmann equation the mass spectra of broad resonances follow instantaneously their in-medium spectral functions as expected from the Markovian approximation to the Kadanoff-Baym equations employed via the (local) gradient expansion.

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