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.

Details

Title
Thermal Sunyaev–Zel’dovich Effect in the IGM due to Primordial Magnetic Fields
Author
Minoda, Teppei 1   VIAFID ORCID Logo  ; Hasegawa, Kenji 1 ; Tashiro, Hiroyuki 1 ; Ichiki, Kiyotomo 2 ; Sugiyama, Naoshi 3 

1  Department of Physics and Astrophysics, Nagoya University, Nagoya 464-8602, Japan 
2  Department of Physics and Astrophysics, Nagoya University, Nagoya 464-8602, Japan; Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan 
3  Department of Physics and Astrophysics, Nagoya University, Nagoya 464-8602, Japan; Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan; Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), The University of Tokyo, Chiba 277-8582, Japan 
First page
143
Publication year
2018
Publication date
2018
Publisher
MDPI AG
e-ISSN
20754434
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.3390/galaxies6040143
ProQuest document ID
2582800048
Copyright
© 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.