Journal
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
Volume 48, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6471/abbc5c
Keywords
hadron gas; bulk viscosity; Monte-Carlo simulations; heavy-ion collisions
Categories
Funding
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [315477589-TRR 211]
- DFG [411563442]
- Helmholtz International Center for the Facility for Antiproton and Ion Research (HIC for FAIR) within the framework of the Landes-Offensive zur Entwicklung Wissenschaftlich-Oekonomischer Exzellenz (LOEWE) program
Ask authors/readers for more resources
The study investigates the temperature dependence of bulk viscosity in a relativistic hadron gas, showing a decreasing trend of overall bulk viscosity with increasing temperature, while the effective bulk viscosity does not have a strong dependence on temperature. The analysis also considers the strong influence of resonances and their lifetimes.
We estimate the temperature dependence of the bulk viscosity in a relativistic hadron gas. Employing the Green-Kubo formalism in the SMASH (Simulating Many Accelerated Strongly-interacting Hadrons) transport approach, we study different hadronic systems in increasing order of complexity. We analyze the (in)validity of the single exponential relaxation ansatz for the bulk-channel correlation function and the strong influence of the resonances and their lifetimes. We discuss the difference between the inclusive bulk viscosity of an equilibrated, long-lived system, and the effective bulk viscosity of a short-lived mixture like the hadronic phase of relativistic heavy-ion collisions, where the processes whose inverse relaxation rate are larger than the fireball duration are excluded from the analysis. This clarifies the differences between previous approaches which computed the bulk viscosity including/excluding the very slow processes in the hadron gas. We compare our final results with previous hadron gas calculations and confirm a decreasing trend of the inclusive bulk viscosity over entropy density as temperature increases, whereas the effective bulk viscosity to entropy ratio, while being lower than the inclusive one, shows no strong dependence to temperature.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available