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 language | English (US) |
|---|---|
| Pages (from-to) | 357-361 |
| Number of pages | 5 |
| Journal | Astrophysical Journal |
| Volume | 397 |
| Issue number | 2 |
| State | Published - 1992 |
| Externally published | Yes |
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Keywords
- Cosmology: theory
- Gravitation
- Gravitational lensing
ASJC Scopus subject areas
- Space and Planetary Science
Cite this
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 journal › Article
}
TY - JOUR
T1 - Gravitational lensing and the variability of G
AU - Krauss, Lawrence
AU - White, Martin
PY - 1992
Y1 - 1992
N2 - 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.
AB - 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.
KW - Cosmology: theory
KW - Gravitation
KW - Gravitational lensing
UR - http://www.scopus.com/inward/record.url?scp=11944266701&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=11944266701&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:11944266701
VL - 397
SP - 357
EP - 361
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
ER -