Interaction and heat exchange in two-component relativistic fluid

TL;DR

This paper presents a model of two-component relativistic fluid highlighting thermal coupling effects that influence the fluid's non-ideality without affecting hydrodynamic motion, and provides a general decomposition framework.

Contribution

It introduces a new model describing thermal coupling in two-component relativistic fluids and formulates a general two-fluid decomposition for interacting systems.

Findings

Thermal coupling causes non-ideality in the fluid.

Interaction affects the equation of state but not hydrodynamics.

A general two-fluid decomposition is established.

Abstract

A model of two-component relativistic fluid is considered, and the thermal nature of coupling between the fluid constituents is outlined. This thermal coupling is responsible for non-ideality of the fluid composite where the components are not fully independent. The interaction between particles is reflected only in the equation of state of each component, but it deals nothing with the coupling between the fluid components and does not influence the hydrodynamic motion. A general form of two-fluid decomposition is formulated for arbitrary interacting system.