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
Autor principal: Landau, Susana J.
Publicado: 2016
Materias:
galaxy clusters
modified gravity
supernovas
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14757516_v2016_n8_p_Holanda
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 paper:paper_14757516_v2016_n8_p_Holanda
record_format dspace
spelling paper:paper_14757516_v2016_n8_p_Holanda2023-06-08T16:17:57Z Galaxy clusters, type Ia supernovae and the fine structure constant Landau, Susana 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. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14757516_v2016_n8_p_Holanda 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
Landau, Susana 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 .
author Landau, Susana J.
author_facet Landau, Susana J.
author_sort Landau, Susana J.
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
publishDate 2016
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14757516_v2016_n8_p_Holanda
http://hdl.handle.net/20.500.12110/paper_14757516_v2016_n8_p_Holanda
work_keys_str_mv AT landaususanaj galaxyclusterstypeiasupernovaeandthefinestructureconstant
_version_ 1768544100091428864

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