Coport: A New Public Code for Polarized Radiative Transfer in a Covariant Framework$^\spadesuit$

TL;DR

Coport is a new Julia-based public code for covariant polarized radiative transfer in curved spacetime, enabling precise modeling of black hole environments by directly solving coupled equations without separating spacetime and plasma effects.

Contribution

It introduces Coport, a novel, efficient, and accurate code for covariant polarized radiative transfer that integrates gravity and plasma effects without separation, validated against multiple benchmarks.

Findings

Validated against analytical solutions

Accurately models thin and thick disk scenarios

Eliminates need for separate spacetime and plasma computations

Abstract

General relativistic radiative transfer calculations are essential for comparing theoretical models of black hole accretion flows and jets with observational data. In this work, we introduce Coport, a novel public code specifically designed for covariant polarized ray-tracing radiative transfer computations in any spacetime. Written in Julia, Coport includes an interface for visualizing numerical results obtained from HARM, a publicly available implementation of the general relativistic magnetohydrodynamics code. We validate the precision of our code by comparing its outputs with the results from a variety of established methodologies. This includes the verification against analytical solutions, the validation through thin-disk assessments, and the evaluation via thick-disk analyses. Notably, our code employs a methodology that eliminates the need for separating the computations of spacetime propagation and plasma propagation. Instead, it directly solves the coupled, covariant, polarized radiative transfer equation in curved spacetime, seamlessly integrating the effects of gravity with plasma influences. This approach sets our code apart from the existing alternatives and enhances its accuracy and efficiency.