PHSD-PHQMD is a unified non-equilibrium microscopic transport framework for the description of strongly-interacting hadronic and partonic matter in heavy-ion collisions.
This repository hosts the static website of the PHSD-PHQMD project (GitHub Pages ready).
The Parton-Hadron-String Dynamics (PHSD) is a microscopic off-shell transport approach for the description of strongly interacting hadronic and partonic matter in and out-of-equilibrium. It is based on the solution of Kadanoff-Baym equations in first-order gradient expansion in phase space, allowing a causal description of the time evolution of nonperturbative interacting systems. PHSD consistently describes the full evolution of a relativistic heavy-ion collision from the initial hard scatterings and string formation through the dynamical deconfinement phase transition to the quark-gluon plasma, followed by hadronization and subsequent hadronic interactions. The PHSD has been developed by the Giessen/Frankfurt groups on the basis of the Hadron-String Dynamics transport approach (HSD).
The Parton-Hadron-Quantum-Molecular Dynamics (PHQMD) transport approach is designed to provide a microscopic description of nuclear cluster and hypernucleus formation as well as general particle production in heavy-ion reactions at relativistic energies.
In difference to coalescence or statistical models, often used for cluster formation, PHQMD forms clusters dynamically due to interactions between baryons described on the basis of Quantum Molecular Dynamics (QMD), which allows propagation of the n-body Wigner density and n-body correlations in phase-space, essential for cluster formation.
Clusters are identified by the MST (Minimum Spanning Tree) or the SACA (Simulated Annealing Cluster Algorithm), which finds the most bound configuration of nucleons and clusters. Collisions among hadrons, Quark-Gluon-Plasma formation, and parton dynamics in PHQMD are treated in the same way as in the established Parton-Hadron-String Dynamics (PHSD) approach.