2009/07/18 by Massimo Giovannini
Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Cosmology and Gravitation Theories #Solar and Space Plasma Dynamics #astro-ph.CO #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1088/0264-9381/27/10/105011
published as Class.Quant.Grav.27:105011,2010 · 41 pages, 10 figures
arxiv created 2009/07/18 · openalex publication_date 2010/04/20 · arxiv updated 2010/04/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The impact of large-scale magnetic fields on the interplay between the ordinary and integrated Sachs–Wolfe effects is investigated in the presence of a fluctuating dark energy component. The modified initial conditions of the Einstein–Boltzmann hierarchy allow for the simultaneous inclusion of dark energy perturbations and of large-scale magnetic fields. The temperature and polarization angular power spectra are compared with the results obtained in the magnetized version of the (minimal) concordance model. Purported compensation effects arising at large scales are specifically investigated. The fluctuating dark energy component modifies, in a computable manner, the shapes of the 1- and 2-σ contours in the parameter space of the magnetized background. The allowed spectral indices and magnetic field intensities turn out to be slightly larger than those determined in the framework of the magnetized concordance model where the dark energy fluctuations are absent.