Nucleon matter equation of state, particle number fluctuations, and shear viscosity within UrQMD box calculations

TL;DR

This paper investigates the properties of an equilibrated nucleon system using UrQMD simulations within a finite box, focusing on the equation of state, particle fluctuations, and shear viscosity, and compares results with theoretical models.

Contribution

It provides a detailed analysis of nucleon matter properties in equilibrium using UrQMD and compares findings with statistical mechanics and kinetic theory.

Findings

UrQMD reproduces expected equilibrium spectra and fluctuations.

Shear viscosity values are consistent with theoretical predictions.

Equation of state matches classical nucleon models.

Abstract

Properties of equilibrated nucleon system are studied within the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) transport model. The UrQMD calculations are done within a finite box with periodic boundary conditions. The system achieves thermal equilibrium due to nucleon-nucleon elastic scattering. For the UrQMD equilibrium state, nucleon energy spectra, equation of state, particle number fluctuations, and shear viscosity $\eta$ are calculated. The UrQMD results are compared with both, statistical mechanics and Chapman-Enskog kinetic theory, for a classical system of nucleons with hard-core repulsion.