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, G.C., Harari, D.D., Frieman, J.A.
Formato: JOUR
Materias:
Cosmology: Theory
Distance scale
Gravitational lensing
Large-scale structure of universe
Acceso en línea: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
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spelling todo:paper_0004637X_v464_n1PARTI_p54_Surpi2023-10-03T14:01:40Z Large-scale structure and the determination of Ho from gravitational lens time delays Surpi, G.C. Harari, D.D. Frieman, J.A. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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, G.C.
Harari, D.D.
Frieman, J.A.
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.
format JOUR
author Surpi, G.C.
Harari, D.D.
Frieman, J.A.
author_facet Surpi, G.C.
Harari, D.D.
Frieman, J.A.
author_sort Surpi, G.C.
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
url http://hdl.handle.net/20.500.12110/paper_0004637X_v464_n1PARTI_p54_Surpi
work_keys_str_mv AT surpigc largescalestructureandthedeterminationofhofromgravitationallenstimedelays
AT hararidd largescalestructureandthedeterminationofhofromgravitationallenstimedelays
AT friemanja largescalestructureandthedeterminationofhofromgravitationallenstimedelays
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