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Title:
Gravitational lensing and the variability of G
Authors:
Krauss, Lawrence M.; White, Martin
Affiliation:
AA(Yale University., New Haven, CT), AB(Yale University., New Haven, CT)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 397, no. 2, p. 357-361. (ApJ Homepage)
Publication Date:
10/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Cosmology, Gravitational Constant, Gravitational Lenses, Quasars, Astronomical Models, Computational Astrophysics
DOI:
10.1086/171792
Bibliographic Code:
1992ApJ...397..357K

Abstract

The four observables associated with gravitational lensing of distant quasars by intervening galaxies - image splittings, relative amplifications, time delays, and optical depths - provide separate measures of the strength of the gravitational constant G at cosmological distances. These allow one, in principle, to factor out unknown lensing parameters to directly probe the variation of G over cosmological time. We estimate constraints on G(dot) which may be derivable by this method both now and in the future. The limits one may obtain can compete or exceed other direct limits on G(dot) today, but unfortunately extracting this information is not independent of the effort to fix other cosmological parameters such as H(0) and Omega(0) from lensing observations.

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