A magnetized completion of the $\Lambda$CDM paradigm

TL;DR

This paper introduces a magnetized extension to the standard $\\Lambda$CDM model, analyzing its effects on CMB anisotropies with a new numerical approach that incorporates large-scale magnetic fields into the cosmological framework.

Contribution

It presents a novel numerical method to include large-scale magnetic fields in the Einstein-Boltzmann hierarchy within the $\Lambda$CDM paradigm.

Findings

Magnetic fields influence CMB temperature and polarization spectra.

The numerical approach improves accuracy in modeling magnetized cosmologies.

Results facilitate the inclusion of magnetic effects in cosmological parameter estimation.

Abstract

The standard $\Lambda$CDM paradigm is complemented with a magnetized contribution whose effects on the anisotropies of the Cosmic Microwave Background (CMB) are assessed by means of a dedicated numerical approach. The accuracy on the temperature and polarization correlations stems from the inclusion of the large-scale magnetic fields both at the level of the initial conditions and at the level of the Einstein-Boltzmann hierarchy which is consistently embedded in a generalized magnetohydrodynamical framework. Examples of the calculations of the temperature and polarization angular power spectra are illustrated and discussed. The reported results and the described numerical tools set the ground for a consistent inclusion of a magnetized contribution in current strategies of cosmological parameter estimation.