Highly anisotropic hydrodynamics -- discussion of the model assumptions and forms of the initial conditions

TL;DR

This paper analyzes the assumptions and initial conditions of the highly anisotropic hydrodynamics (ADHYDRO) model, examining how these factors influence isotropization and comparing with other anisotropic fluid frameworks.

Contribution

It provides a detailed discussion of the model assumptions, explores the impact of initial conditions, and compares ADHYDRO with alternative approaches to anisotropic hydrodynamics.

Findings

Dependence of numerical results on entropy source forms

Impact of initial conditions on isotropization process

Comparison with other anisotropic fluid frameworks

Abstract

The model assumptions of the recently formulated framework of highly-anisotropic and strongly-dissipative hydrodynamics (ADHYDRO) are analyzed. In particular, we study dependence of numerical results on different forms of the entropy source and compare our approach with other frameworks describing locally anisotropic fluids. We also discuss the effects of different forms of the initial conditions on the process of isotropization.