Large-scale structure and the determination of Ho from gravitational lens time delays

We analyze the effects of large-scale inhomogeneities upon the observables of a gravitational lens system, focusing on the issue of whether large-scale structure imperils the program to determine the Hubble parameter through measurements of time delays between multiple images in lens systems. We fin...

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Autores principales: Surpi, Gabriela Clara, Harari, Diego Darío
Publicado: 1996
Materias:
Cosmology: Theory
Distance scale
Gravitational lensing
Large-scale structure of universe
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v464_n1PARTI_p54_Surpi
http://hdl.handle.net/20.500.12110/paper_0004637X_v464_n1PARTI_p54_Surpi
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_0004637X_v464_n1PARTI_p54_Surpi
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spelling paper:paper_0004637X_v464_n1PARTI_p54_Surpi2023-06-08T14:28:36Z Large-scale structure and the determination of Ho from gravitational lens time delays Surpi, Gabriela Clara Harari, Diego Darío Cosmology: Theory Distance scale Gravitational lensing Large-scale structure of universe We analyze the effects of large-scale inhomogeneities upon the observables of a gravitational lens system, focusing on the issue of whether large-scale structure imperils the program to determine the Hubble parameter through measurements of time delays between multiple images in lens systems. We find that the lens equation in a spatially flat Robertson-Walker cosmology with scalar metric fluctuations is equivalent, to the leading order of approximation, to that for the same lensing system in the absence of fluctuations but with a different angular position of the source relative to the lens axis. Since the absolute position of the source is not observable, gravitational lens measurements cannot directly reveal the presence of large-scale structure. Large-scale perturbations do not modify the functional relationship between observable lens parameters and the Hubble parameter and therefore do not seriously affect the determination of Ho from lens time delays. © 1996. The American Astronomical Society. All rights reserved. Fil:Surpi, G.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Harari, D.D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1996 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v464_n1PARTI_p54_Surpi http://hdl.handle.net/20.500.12110/paper_0004637X_v464_n1PARTI_p54_Surpi
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Cosmology: Theory
Distance scale
Gravitational lensing
Large-scale structure of universe
spellingShingle Cosmology: Theory
Distance scale
Gravitational lensing
Large-scale structure of universe
Surpi, Gabriela Clara
Harari, Diego Darío
Large-scale structure and the determination of Ho from gravitational lens time delays
topic_facet Cosmology: Theory
Distance scale
Gravitational lensing
Large-scale structure of universe
description We analyze the effects of large-scale inhomogeneities upon the observables of a gravitational lens system, focusing on the issue of whether large-scale structure imperils the program to determine the Hubble parameter through measurements of time delays between multiple images in lens systems. We find that the lens equation in a spatially flat Robertson-Walker cosmology with scalar metric fluctuations is equivalent, to the leading order of approximation, to that for the same lensing system in the absence of fluctuations but with a different angular position of the source relative to the lens axis. Since the absolute position of the source is not observable, gravitational lens measurements cannot directly reveal the presence of large-scale structure. Large-scale perturbations do not modify the functional relationship between observable lens parameters and the Hubble parameter and therefore do not seriously affect the determination of Ho from lens time delays. © 1996. The American Astronomical Society. All rights reserved.
author Surpi, Gabriela Clara
Harari, Diego Darío
author_facet Surpi, Gabriela Clara
Harari, Diego Darío
author_sort Surpi, Gabriela Clara
title Large-scale structure and the determination of Ho from gravitational lens time delays
title_short Large-scale structure and the determination of Ho from gravitational lens time delays
title_full Large-scale structure and the determination of Ho from gravitational lens time delays
title_fullStr Large-scale structure and the determination of Ho from gravitational lens time delays
title_full_unstemmed Large-scale structure and the determination of Ho from gravitational lens time delays
title_sort large-scale structure and the determination of ho from gravitational lens time delays
publishDate 1996
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v464_n1PARTI_p54_Surpi
http://hdl.handle.net/20.500.12110/paper_0004637X_v464_n1PARTI_p54_Surpi
work_keys_str_mv AT surpigabrielaclara largescalestructureandthedeterminationofhofromgravitationallenstimedelays
AT hararidiegodario largescalestructureandthedeterminationofhofromgravitationallenstimedelays
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