Thermodynamics of magnetized binary compact objects

TL;DR

This paper extends thermodynamic laws to magnetized binary compact objects with electromagnetic fields, deriving relations between physical quantities and discussing equilibrium solutions in magnetohydrodynamics.

Contribution

It introduces a generalized first law for magnetized binary systems, incorporating electromagnetic effects into thermodynamic relations and equilibrium conditions.

Findings

Extended thermodynamic laws to include electromagnetic fields.

Derived a relation between Noether charge change and physical properties.

Discussed numerical solution approaches for equilibrium magnetized binaries.

Abstract

Binary systems of compact objects with electromagnetic field are modeled by helically symmetric Einstein-Maxwell spacetimes with charged and magnetized perfect fluids. Previously derived thermodynamic laws for helically-symmetric perfect-fluid spacetimes are extended to include the electromagnetic fields, and electric currents and charges; the first law is written as a relation between the change in the asymptotic Noether charge $\dl Q$ and the changes in the area and electric charge of black holes, and in the vorticity, baryon rest mass, entropy, charge and magnetic flux of the magnetized fluid. Using the conservation laws of the circulation of magnetized flow found by Bekenstein and Oron for the ideal magnetohydrodynamic (MHD) fluid, and also for the flow with zero conducting current, we show that, for nearby equilibria that conserve the quantities mentioned above, the relation $\dl Q=0$ is satisfied. We also discuss a formulation for computing numerical solutions of magnetized binary compact objects in equilibrium with emphasis on a first integral of the ideal MHD-Euler equation.