BiGONLight: light propagation with bi-local operators in Numerical Relativity

TL;DR

BiGONLight introduces a novel framework using bi-local geodesic operators for efficient light propagation in Numerical Relativity, enabling extraction of multiple observables including distance measures and redshift drift in various cosmological models.

Contribution

It presents a new formalism and software implementation for light propagation in General Relativity, capable of computing multiple observables simultaneously in complex cosmological models.

Findings

Excellent agreement with known results in tested models

Able to extract multiple observables from a single computation

Applicable to both homogeneous and inhomogeneous cosmologies

Abstract

BiGONLight, Bi-local Geodesic Operators framework for Numerical Light propagation, is a new tool for light propagation in Numerical Relativity. The package implements the Bi-local Geodesic Operators formalism, a new framework for light propagation in General Relativity. With BiGONLight it is possible to extract observables such as angular diameter distance, luminosity distance, magnification as well as new real-time observables like parallax and redshift drift within the same computation. As test-bed for our code we consider two cosmological models, the $\Lambda$CDM and the inhomogeneous Szekeres model, and a simulated dust universe. All our tests show an excellent agreement with known results.