Entropy development in ideal relativistic fluid dynamics with the Bag Model equation of state

TL;DR

This paper investigates entropy production in ideal relativistic fluid dynamics of quark-gluon plasma, considering effects like numerical viscosity, Bag constant influence, and freeze-out processes, to better understand the evolution of high-energy nuclear matter.

Contribution

It provides a detailed analysis of entropy development in relativistic fluid models of QGP, incorporating effects of the Bag Model equation of state and freeze-out dynamics.

Findings

Entropy production is sensitive to numerical viscosity.

Late-stage flow effects are significant when Bag constant and pressure are comparable.

Freeze-out and quark matter formation impact entropy evolution.

Abstract

We consider an idealized situation where the Quark-Gluon Plasma (QGP) is described by a perfect, 3+1 dimensional fluid dynamic model starting from an initial state and expanding until a final state where freeze-out and/or hadronization takes place. We study the entropy production with attention to effects of (i) numerical viscosity, (ii) late stages of flow where the Bag Constant and the partonic pressure are becoming similar, (iii) and the consequences of final freeze-out and constituent quark matter formation.