Advanced Three Level Approximation for Numerical Treatment of Cosmological Recombination

TL;DR

This paper introduces a new numerical code based on the three-level approximation for efficient and accurate modeling of primordial hydrogen-helium recombination in cosmology, incorporating fine physical effects and fudge factors.

Contribution

The paper presents a publicly available code that improves the modeling of cosmological recombination using the three-level approximation with added physical effects.

Findings

Fast calculations of recombination history achieved.

Inclusion of fine physical effects enhances model accuracy.

Code is publicly accessible for community use.

Abstract

New public numerical code for fast calculations of the cosmological recombination of primordial hydrogen-helium plasma is presented. The code is based on the three-level approximation (TLA) model of recombination and allows us to take into account some fine physical effects of cosmological recombination simultaneously with using fudge factors. The code can be found at http://www.ioffe.ru/astro/QC/CMBR/atlant/atlant.html