Galaxy clusters, type Ia supernovae and the fine structure constant

As is well known, measurements of the Sunyaev-Zeldovich effect can be combined with observations of the X-ray surface brightness of galaxy clusters to estimate the angular diameter distance to these structures. In this paper, we show that this technique depends on the fine structure constant, α. The...

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Detalles Bibliográficos
Autores principales:	Holanda, R.F.L., Busti, V.C., Colaço, L.R., Alcaniz, J.S., Landau, S.J.
Formato:	JOUR
Materias:	galaxy clusters modified gravity supernovas
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_14757516_v2016_n8_p_Holanda
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_14757516_v2016_n8_p_Holanda
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spelling	todo:paper_14757516_v2016_n8_p_Holanda2023-10-03T16:18:51Z Galaxy clusters, type Ia supernovae and the fine structure constant Holanda, R.F.L. Busti, V.C. Colaço, L.R. Alcaniz, J.S. Landau, S.J. galaxy clusters modified gravity supernovas As is well known, measurements of the Sunyaev-Zeldovich effect can be combined with observations of the X-ray surface brightness of galaxy clusters to estimate the angular diameter distance to these structures. In this paper, we show that this technique depends on the fine structure constant, α. Therefore, if α is a time-dependent quantity, e.g., α = α0φ(z), where φ is a function of redshift, we argue that current data do not provide the real angular diameter distance, DA(z), to the cluster, but instead DA data(z) = φ(z)2 DA(z). We use this result to derive constraints on a possible variation of α for a class of dilaton runaway models considering a sample of 25 measurements of DA data(z) in redshift range 0.023 < z < 0.784 and estimates of DA(z) from current type Ia supernovae observations. We find no significant indication of variation of α with the present data. © 2016 IOP Publishing Ltd and Sissa Medialab srl . Fil:Landau, S.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_14757516_v2016_n8_p_Holanda
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	galaxy clusters modified gravity supernovas
spellingShingle	galaxy clusters modified gravity supernovas Holanda, R.F.L. Busti, V.C. Colaço, L.R. Alcaniz, J.S. Landau, S.J. Galaxy clusters, type Ia supernovae and the fine structure constant
topic_facet	galaxy clusters modified gravity supernovas
description	As is well known, measurements of the Sunyaev-Zeldovich effect can be combined with observations of the X-ray surface brightness of galaxy clusters to estimate the angular diameter distance to these structures. In this paper, we show that this technique depends on the fine structure constant, α. Therefore, if α is a time-dependent quantity, e.g., α = α0φ(z), where φ is a function of redshift, we argue that current data do not provide the real angular diameter distance, DA(z), to the cluster, but instead DA data(z) = φ(z)2 DA(z). We use this result to derive constraints on a possible variation of α for a class of dilaton runaway models considering a sample of 25 measurements of DA data(z) in redshift range 0.023 < z < 0.784 and estimates of DA(z) from current type Ia supernovae observations. We find no significant indication of variation of α with the present data. © 2016 IOP Publishing Ltd and Sissa Medialab srl .
format	JOUR
author	Holanda, R.F.L. Busti, V.C. Colaço, L.R. Alcaniz, J.S. Landau, S.J.
author_facet	Holanda, R.F.L. Busti, V.C. Colaço, L.R. Alcaniz, J.S. Landau, S.J.
author_sort	Holanda, R.F.L.
title	Galaxy clusters, type Ia supernovae and the fine structure constant
title_short	Galaxy clusters, type Ia supernovae and the fine structure constant
title_full	Galaxy clusters, type Ia supernovae and the fine structure constant
title_fullStr	Galaxy clusters, type Ia supernovae and the fine structure constant
title_full_unstemmed	Galaxy clusters, type Ia supernovae and the fine structure constant
title_sort	galaxy clusters, type ia supernovae and the fine structure constant
url	http://hdl.handle.net/20.500.12110/paper_14757516_v2016_n8_p_Holanda
work_keys_str_mv	AT holandarfl galaxyclusterstypeiasupernovaeandthefinestructureconstant AT bustivc galaxyclusterstypeiasupernovaeandthefinestructureconstant AT colacolr galaxyclusterstypeiasupernovaeandthefinestructureconstant AT alcanizjs galaxyclusterstypeiasupernovaeandthefinestructureconstant AT landausj galaxyclusterstypeiasupernovaeandthefinestructureconstant
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Galaxy clusters, type Ia supernovae and the fine structure constant

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