Small-scale CMB anisotropies induced by the primordial magnetic fields
The primordial magnetic fields (PMFs) produced in the early universe are expected to be the origin of the large-scale cosmic magnetic fields. The PMFs are considered to leave a footprint on the cosmic microwave background (CMB) anisotropies due to both the electromagnetic force and gravitational int...
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ftdatacite:10.48550/arxiv.2012.12542 2023-05-15T18:22:40+02:00 Small-scale CMB anisotropies induced by the primordial magnetic fields Minoda, Teppei Ichiki, Kiyotomo Tashiro, Hiroyuki 2020 https://dx.doi.org/10.48550/arxiv.2012.12542 https://arxiv.org/abs/2012.12542 unknown arXiv https://dx.doi.org/10.1088/1475-7516/2021/03/093 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences article-journal Article ScholarlyArticle Text 2020 ftdatacite https://doi.org/10.48550/arxiv.2012.12542 https://doi.org/10.1088/1475-7516/2021/03/093 2022-03-10T15:20:58Z The primordial magnetic fields (PMFs) produced in the early universe are expected to be the origin of the large-scale cosmic magnetic fields. The PMFs are considered to leave a footprint on the cosmic microwave background (CMB) anisotropies due to both the electromagnetic force and gravitational interaction. In this paper, we investigate how the PMFs affect the CMB anisotropies on smaller scales than the mean-free-path of the CMB photons. We solve the baryon Euler equation with Lorentz force due to the PMFs, and we show that the vector-type perturbations from the PMFs induce the CMB anisotropies below the Silk scale as $\ell>3000$. Based on our calculations, we put a constraint on the PMFs from the combined CMB temperature anisotropies obtained by Planck and South Pole Telescope (SPT). We have found that the highly-resolved temperature anisotropies of the SPT 2017 bandpowers at $\ell \lesssim 8000$ favor the PMF model with a small scale-dependence. As a result, the Planck and SPT's joint-analysis puts a constraint on the PMF spectral index as $n_B : 18 pages, 5 figures, 1 table, published in JCAP Article in Journal/Newspaper South pole DataCite Metadata Store (German National Library of Science and Technology) South Pole |
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Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences |
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Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences Minoda, Teppei Ichiki, Kiyotomo Tashiro, Hiroyuki Small-scale CMB anisotropies induced by the primordial magnetic fields |
topic_facet |
Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences |
description |
The primordial magnetic fields (PMFs) produced in the early universe are expected to be the origin of the large-scale cosmic magnetic fields. The PMFs are considered to leave a footprint on the cosmic microwave background (CMB) anisotropies due to both the electromagnetic force and gravitational interaction. In this paper, we investigate how the PMFs affect the CMB anisotropies on smaller scales than the mean-free-path of the CMB photons. We solve the baryon Euler equation with Lorentz force due to the PMFs, and we show that the vector-type perturbations from the PMFs induce the CMB anisotropies below the Silk scale as $\ell>3000$. Based on our calculations, we put a constraint on the PMFs from the combined CMB temperature anisotropies obtained by Planck and South Pole Telescope (SPT). We have found that the highly-resolved temperature anisotropies of the SPT 2017 bandpowers at $\ell \lesssim 8000$ favor the PMF model with a small scale-dependence. As a result, the Planck and SPT's joint-analysis puts a constraint on the PMF spectral index as $n_B : 18 pages, 5 figures, 1 table, published in JCAP |
format |
Article in Journal/Newspaper |
author |
Minoda, Teppei Ichiki, Kiyotomo Tashiro, Hiroyuki |
author_facet |
Minoda, Teppei Ichiki, Kiyotomo Tashiro, Hiroyuki |
author_sort |
Minoda, Teppei |
title |
Small-scale CMB anisotropies induced by the primordial magnetic fields |
title_short |
Small-scale CMB anisotropies induced by the primordial magnetic fields |
title_full |
Small-scale CMB anisotropies induced by the primordial magnetic fields |
title_fullStr |
Small-scale CMB anisotropies induced by the primordial magnetic fields |
title_full_unstemmed |
Small-scale CMB anisotropies induced by the primordial magnetic fields |
title_sort |
small-scale cmb anisotropies induced by the primordial magnetic fields |
publisher |
arXiv |
publishDate |
2020 |
url |
https://dx.doi.org/10.48550/arxiv.2012.12542 https://arxiv.org/abs/2012.12542 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
https://dx.doi.org/10.1088/1475-7516/2021/03/093 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.48550/arxiv.2012.12542 https://doi.org/10.1088/1475-7516/2021/03/093 |
_version_ |
1766202077495689216 |