ADHYDRO --- hydrodynamics-like model for highly anisotropic systems

TL;DR

ADHYDRO is a hydrodynamics-like model designed to describe the early highly-anisotropic stages of relativistic heavy-ion collisions, incorporating dissipation effects that vanish as systems become isotropic.

Contribution

It introduces a new framework, ADHYDRO, that models anisotropic systems with dissipation, bridging the gap between ideal hydrodynamics and realistic early-stage collision dynamics.

Findings

Provides equations for isotropization of anisotropic systems

Includes a dissipation mechanism dependent on pressure anisotropy

Ensures dissipation effects vanish for isotropic systems

Abstract

A new framework (ADHYDRO) is presented that has been designed for description of highly-anisotropic systems produced at the very early stages of relativistic heavy-ion collisions. The structure of ADHYDRO is very much similar to perfect-fluid hydrodynamics, however, ADHYDRO includes dissipation effects. Dissipation is defined by the form of the entropy source that depends on the pressure anisotropy and vanishes for the isotropic systems. With a simple ansatz for the entropy source, that obeys general physical requirements, we obtain the system of equations describing isotropization of the anisotropic systems.