Constraints on the variation of fine structure constant from joint SPT-SZ and XMM-Newton observations
We search for a variation of the electromagnetic fine structure constant (α ≡ e2/ c) using a sample of 58 SZ selected clusters in the redshift range (0.2<z<1.5) detected by the South Pole Telescope, along with X-ray measurements using the XMM-Newton observatory. We use the ratio of the integra...
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Online Access: | http://raiith.iith.ac.in/7881/ https://doi.org/10.1088/1475-7516/2021/02/012 |
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ftiith:oai:raiith.iith.ac.in:7881 2023-05-15T18:22:38+02:00 Constraints on the variation of fine structure constant from joint SPT-SZ and XMM-Newton observations Bora, K. Desai, Shantanu 2021-02 http://raiith.iith.ac.in/7881/ https://doi.org/10.1088/1475-7516/2021/02/012 unknown IOP Publishing Ltd Bora, K. and Desai, Shantanu (2021) Constraints on the variation of fine structure constant from joint SPT-SZ and XMM-Newton observations. Journal of Cosmology and Astroparticle Physics, 2021 (012). ISSN 14757516 Computer science Physics Astronomy Astrophysics Article PeerReviewed 2021 ftiith https://doi.org/10.1088/1475-7516/2021/02/012 2022-09-28T08:36:25Z We search for a variation of the electromagnetic fine structure constant (α ≡ e2/ c) using a sample of 58 SZ selected clusters in the redshift range (0.2<z<1.5) detected by the South Pole Telescope, along with X-ray measurements using the XMM-Newton observatory. We use the ratio of the integrated SZ Compto-ionization to its X-ray counterpart as our observable for this search. We first obtain a model-independent constraint on α of about 0.7%, using the fact that the aforementioned ratio is constant as function of redshift. We then look for logarithmic dependence of α as a function of redshift: Δ α/α = -γ (1+z), as this is predicted by runaway dilaton models. We find that γ = -0.046 ± 0.1, which indicates that there is no logarithmic variation of α as a function redshift. We also search for a dipole variation of the fine structure constant using the same cluster sample. We do not find any evidence for such a spatial variation. Article in Journal/Newspaper South pole Research Archive of Indian Institute of Technology, Hyderabad (RAIITH) South Pole Journal of Cosmology and Astroparticle Physics 2021 02 012 012 |
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Research Archive of Indian Institute of Technology, Hyderabad (RAIITH) |
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Computer science Physics Astronomy Astrophysics |
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Computer science Physics Astronomy Astrophysics Bora, K. Desai, Shantanu Constraints on the variation of fine structure constant from joint SPT-SZ and XMM-Newton observations |
topic_facet |
Computer science Physics Astronomy Astrophysics |
description |
We search for a variation of the electromagnetic fine structure constant (α ≡ e2/ c) using a sample of 58 SZ selected clusters in the redshift range (0.2<z<1.5) detected by the South Pole Telescope, along with X-ray measurements using the XMM-Newton observatory. We use the ratio of the integrated SZ Compto-ionization to its X-ray counterpart as our observable for this search. We first obtain a model-independent constraint on α of about 0.7%, using the fact that the aforementioned ratio is constant as function of redshift. We then look for logarithmic dependence of α as a function of redshift: Δ α/α = -γ (1+z), as this is predicted by runaway dilaton models. We find that γ = -0.046 ± 0.1, which indicates that there is no logarithmic variation of α as a function redshift. We also search for a dipole variation of the fine structure constant using the same cluster sample. We do not find any evidence for such a spatial variation. |
format |
Article in Journal/Newspaper |
author |
Bora, K. Desai, Shantanu |
author_facet |
Bora, K. Desai, Shantanu |
author_sort |
Bora, K. |
title |
Constraints on the variation of fine structure constant from joint SPT-SZ and XMM-Newton observations |
title_short |
Constraints on the variation of fine structure constant from joint SPT-SZ and XMM-Newton observations |
title_full |
Constraints on the variation of fine structure constant from joint SPT-SZ and XMM-Newton observations |
title_fullStr |
Constraints on the variation of fine structure constant from joint SPT-SZ and XMM-Newton observations |
title_full_unstemmed |
Constraints on the variation of fine structure constant from joint SPT-SZ and XMM-Newton observations |
title_sort |
constraints on the variation of fine structure constant from joint spt-sz and xmm-newton observations |
publisher |
IOP Publishing Ltd |
publishDate |
2021 |
url |
http://raiith.iith.ac.in/7881/ https://doi.org/10.1088/1475-7516/2021/02/012 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
Bora, K. and Desai, Shantanu (2021) Constraints on the variation of fine structure constant from joint SPT-SZ and XMM-Newton observations. Journal of Cosmology and Astroparticle Physics, 2021 (012). ISSN 14757516 |
op_doi |
https://doi.org/10.1088/1475-7516/2021/02/012 |
container_title |
Journal of Cosmology and Astroparticle Physics |
container_volume |
2021 |
container_issue |
02 |
container_start_page |
012 |
op_container_end_page |
012 |
_version_ |
1766202034636193792 |