Determination of cosmological parameters by the gravitational lens effect

2006 ◽  
pp. 13-15
Author(s):  
S. Refsdal
Keyword(s):  
Cosmological Parameters ◽  
Gravitational Lens ◽  
Lens Effect

scholarly journals Accurate cosmology from gravitational-lens time delays

2012 ◽  
Vol 8 (S289) ◽  
pp. 331-338
Author(s):  
S. H. Suyu
Keyword(s):  
Time Delay ◽  
Time Delays ◽  
Cosmological Parameters ◽  
Hubble Constant ◽  
Gravitational Lens ◽  
Current Status ◽  
Gravitational Lenses ◽  
Distance Measurements ◽  
One Step

AbstractThe time delays between the multiple images of a strong gravitational-lens system, together with a model of the lens-mass distribution, provide a one-step determination of the time-delay distance, and thus a measure of cosmological parameters, particularly the Hubble constant, H0. I review the recent advances in measuring time-delay distances, and present the current status of cosmological constraints based on gravitational-lens time delays. In particular, I report the time-delay distance measurements of two gravitational lenses and their implication for cosmology from a recent study by Suyuet al.

scholarly journals Cosmological Applications of Gravitational Lensing

1996 ◽  
Vol 168 ◽  
pp. 209-217
Author(s):  
Peter Schneider
Keyword(s):  
Gravitational Lensing ◽  
High Redshift ◽  
Cosmological Parameters ◽  
Gravitational Lens ◽  
Mass Determination ◽  
Gravitational Lenses ◽  
Distant Object ◽  
The Many ◽  
The Universe

It was recognized very early that the gravitational lens effect can be used as an efficient cosmological tool. Of the many researchers who foresaw the use of lensing, F. Zwicky and S. Refsdal should be explicitly mentioned. The perhaps most accurate predictions and foresights by these two authors are as follows: Zwicky estimated the probability that a distant object is multiply imaged to be about 1/400, and thus that the observation of this effect is “a certainty” [73] – his value, which was obtained by a very crude reasoning, is in fact very close to current estimates of the lensing probability of high-redshift QSOs. He predicted that the magnification caused by gravitational light deflection will allow a “deeper look” into the universe –in fact, the spectroscopy of very faint galaxies which are imaged into giant luminous arcs have yielded spectral information which would be very difficult to obtain without these ‘natural telescopes’. And third, Zwicky saw that gravitational lenses may be used to determine the mass of distant extragalactic objects[72] – in fact, the mass determination of clusters masses from giant luminous arcs is as least as accurate as other methods, but does not rely on special assumptions (like spherical symmetry, virial or thermal equilibrium) inherent in other methods, and the determination of the mass within the inner 0.9 arcseconds of the lensing galaxy in the quadruple QSO 2237+0305 to within 2% [52] is the most accurate extragalactic mass determination known. Refsdal predicted the use of gravitational lenses for determining cosmological parameters and for testing cosmological theories [48][49] – we shall return to these issues below.

Gravitational Lens Effect: An Observational Test

Science ◽  
1966 ◽  
Vol 151 (3706) ◽  
pp. 73-74 ◽  
Author(s):  
W. A. Feibelman
Keyword(s):  
Gravitational Lens ◽  
Lens Effect ◽  
Observational Test

A diffraction limit on the gravitational lens effect

1981 ◽  
Vol 78 (1) ◽  
pp. 199-210 ◽  
Author(s):  
Robert J. Bontz ◽  
Mark P. Haugan
Keyword(s):  
Diffraction Limit ◽  
Gravitational Lens ◽  
Lens Effect

Compact radio sources and the determination of the cosmological parameters

1993 ◽  
Vol 10 (S) ◽  
pp. S251-S254 ◽  
Author(s):  
J Roland ◽  
P Charlot ◽  
J F Lestrade ◽  
G Miley ◽  
G Pelletier ◽  
...  
Keyword(s):  
Cosmological Parameters ◽  
Radio Sources
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