# Study of relativistic magnetized outflows with relativistic equation of state

## TL;DR

This paper investigates relativistic magnetized outflows with variable composition and equation of state, revealing how magnetic fields, flow parameters, and composition influence jet collimation, acceleration, and dynamics in a relativistic MHD framework.

## Contribution

It introduces a detailed analysis of relativistic outflows considering variable adiabatic index and composition, highlighting effects on jet acceleration, collimation, and angular momentum transfer.

## Key findings

- Magnetic fields cause collimation and shock formation in outflows.
- Relativistic outflows can reach Lorentz factors exceeding tens.
- Flow composition significantly affects acceleration and temperature.

## Abstract

We study relativistic magnetized outflows using relativistic equation of state having variable adiabatic index ($\Gamma$) and composition parameter $(\xi)$. We study the outflow in special relativistic magneto-hydrodynamic regime, from sub-Alfv\'enic to super-fast domain. We showed that, after the solution crosses the fast point, magnetic field collimates the flow and may form a collimation-shock due to magnetic field pinching/squeezing. Such fast, collimated outflows may be considered as astrophysical jets. Depending on parameters, the terminal Lorentz factors of an electron-proton outflow can comfortably exceed few tens. We showed that due to the transfer of angular momentum from the field to the matter, the azimuthal velocity of the outflow may flip sign. We also study the effect of composition $(\xi)$ on such magnetized outflows. We showed that relativistic outflows are affected by the location of the Alfv\'en point, the polar angle at the Alfv\'en point and also the angle subtended by the field lines with the equatorial plane, but also on the composition of the flow. The pair dominated flow experiences impressive acceleration and is hotter than electron proton flow.