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

Understand

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.