Gravitational Lensing and the Variability of G

Details Gravitational Lensing and the Variability of G Gravitational Lensing and the Variability of G

1992-04-26

arxiv.org/abs/astro-ph/9204002v1

Astrophys.J.397:357,1992

Astronomy and Astrophysics

Astrophysics

13 pages plus figures (not included)

Scientific paper

10.1086/171792

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 to probe the variation of $G$ over cosmological time. We estimate constraints on $\dot{G}$ 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 $\dot{G}$ 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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