Gravitational lensing and the variability of G

Lawrence Krauss, Martin White

Research output: Contribution to journalArticle

19 Citations (Scopus)

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 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 today, but unfortunately extracting this information is not independent of the effort to fix other cosmological parameters such as Ho and Ωo from lensing observations.

Original languageEnglish (US)
Pages (from-to)357-361
Number of pages5
JournalAstrophysical Journal
Volume397
Issue number2
StatePublished - 1992
Externally publishedYes

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gravitational constant
fixing
optical thickness
quasars
optical depth
amplification
time lag
probe
galaxies
probes
estimates
parameter
method

Keywords

  • Cosmology: theory
  • Gravitation
  • Gravitational lensing

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Krauss, L., & White, M. (1992). Gravitational lensing and the variability of G. Astrophysical Journal, 397(2), 357-361.

Gravitational lensing and the variability of G. / Krauss, Lawrence; White, Martin.

In: Astrophysical Journal, Vol. 397, No. 2, 1992, p. 357-361.

Research output: Contribution to journalArticle

Krauss, L & White, M 1992, 'Gravitational lensing and the variability of G', Astrophysical Journal, vol. 397, no. 2, pp. 357-361.
Krauss, Lawrence ; White, Martin. / Gravitational lensing and the variability of G. In: Astrophysical Journal. 1992 ; Vol. 397, No. 2. pp. 357-361.
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