Can I read An Extended Magnetohydrodynamics Model for Relativistic Weakly Collisional Plasmas on EtoBox?

An Extended Magnetohydrodynamics Model for Relativistic Weakly Collisional Plasmas by Chandra, Mani; Gammie, Charles F.; Foucart, Francois; Quataert, Eliot is a scholarly article available to read on EtoBox.

What is An Extended Magnetohydrodynamics Model for Relativistic Weakly Collisional Plasmas about?

Black holes that accrete far below the Eddington limit are believed to accrete through a geometrically thick, optically thin, rotationally supported plasma that we will refer to as a radiatively inefficient accretion flow (RIAF). RIAFs are typically collisionless in the sense that the Coulomb mean free path is large compared to $GM/c^2$, and relativistically hot near the event horizon. In this paper we develop a phenomenological model for the plasma in RIAFs, motivated by the application to sources such as Sgr A* and M87. The model is derived using Israel-Stewart theory, which considers deviations up to second order from thermal equilibrium, but modified for a magnetized plasma. This leads to thermal conduction along magnetic field lines and a difference in pressure, parallel and perpendicular to the field lines (which is equivalent to anisotrotropic viscosity). In the non-relativistic limit, our model reduces to the widely used Braginskii theory of magnetized, weakly collisional plasmas. We compare our model to the existing literature on dissipative relativistic fluids, describe the linear theory of the plasma, and elucidate the physical meaning of the free parameters in the model

Author

Chandra, Mani; Gammie, Charles F.; Foucart, Francois; Quataert, Eliot

Published

2015

Language

EN