Thermal Sunyaev-Zel'dovich Effect in the IGM due to Primordial Magnetic Fields

Abstract

In the present universe, magnetic fields exist with various strengths and on various scales. One possible origin of these cosmic magnetic fields is the primordial magnetic fields (PMFs) generated in the early universe. PMFs are considered to contribute to matter density evolution via Lorentz force and the thermal history of intergalactic medium (IGM) gas due to ambipolar diffusion. Therefore, information about PMFs should be included in the temperature anisotropy of the Cosmic Microwave Background through the thermal Sunyaev-Zel'dovich (tSZ) effect in IGM. In this article, given an initial power spectrum of PMFs, we show the spatial fluctuation of mass density and temperature of the IGM and tSZ angular power spectrum created by the PMFs. Finally, we find that the tSZ angular power spectrum induced by PMFs becomes significant on small scales, even with PMFs below the observational upper limit. Therefore, we conclude that the measurement of tSZ anisotropy on small scales will provide the most stringent constraint on PMFs.

8 pages, 2 figures, Conference report of "The Power of Faraday Tomography---Towards 3D Mapping of Cosmic Magnetic Fields---", published in Galaxies, special issue "The Power of Faraday Tomography"

Cited by in corpus (4)

• Constraints on primordial magnetic fields from magnetically-induced perturbations: current status and future perspectives with LiteBIRD and future ground based experiments
• Constraints on Primordial Magnetic Fields from their impact on the ionization history with Planck 2018
• LiteBIRD Science Goals and Forecasts: Primordial Magnetic Fields
• Workshop summary 'The Power of Faraday Tomography'