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The European High Performance Computing Joint Undertaking (EuroHPC JU)

Non-equilibrium Quark-Gluon Plasma

Awarded Resources (in core hours)
System Partition
8 March 2023 - 7 March 2024
Allocation Period

We request CPU and GPU hours of computational resources for calculating the equilibration of quark-gluon plasma (QGP) in high-energy heavy-ion collisions (HICs).

The QGP is a hot and dense matter that existed only in the first few microseconds after the Big Bang of the Universe. Understanding the quark-gluon plasma, in particular, its thermalization towards equilibrium is one of the main challenges in high-energy nuclear physics. It helps us to understand the thermalization of the early universe as well as the fundamental strong interaction that binds 99% of the visible matter today.

The simulation of such a quantum many-body system is numerically expensive. Since QCD dynamics are extremely hard to simulate, previous studies have focused on only the gluonic Yang-Mills plasma as a simpler model of the quark-gluon plasma.

We have been involved in recent state-of-the-art software developments which include quark degrees of freedom necessary to simulate both kinetic and chemical equilibrations of the QGP in the context of full QCD. This provides a more realistic evolution of the pre-equilibrium QGP before matching to relativistic hydrodynamics by calculating the non-equilibrium evolution of the energy-momentum tensor.

We plan to calculate the QGP response functions of scalar, vector, tensor, and charge perturbations. Numerical calculations require a large amount of computing resources in parallel and can only be achieved by high-performance computing (HPC).