Gravitational lensing and the variability of G
1992; IOP Publishing; Volume: 397; Linguagem: Inglês
10.1086/171792
ISSN1538-4357
AutoresLawrence M. Krauss, Martin White,
Tópico(s)Pulsars and Gravitational Waves Research
Resumoview Abstract Citations (20) References (21) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Gravitational Lensing and the Variability of G Krauss, Lawrence M. ; White, Martin 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 H_0_ and {OMEGA}_0_ from lensing observations. Publication: The Astrophysical Journal Pub Date: October 1992 DOI: 10.1086/171792 arXiv: arXiv:astro-ph/9204002 Bibcode: 1992ApJ...397..357K Keywords: Cosmology; Gravitational Constant; Gravitational Lenses; Quasars; Astronomical Models; Computational Astrophysics; Astrophysics; COSMOLOGY: GRAVITATIONAL LENSING; COSMOLOGY: THEORY; GRAVITATION; Astrophysics E-Print: 13 pages plus figures (not included) full text sources arXiv | ADS |
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