Results 131 to 140 of about 3,386 (168)

GRAVITATIONAL LENS AMPLIFICATION OF GRAVITATIONAL RADIATION

International Journal of Modern Physics D, 2002
In a recent paper by Wang, Turner and Stebbins (1996) an influence of gravitational lensing on increasing an estimated rate of gravitational radiation sources was considered. We show that the authors used the geometrical optics approximation model for gravitational lensing and thus they gave overestimated rate of possible events for possible sources ...
ALEXANDER F. ZAKHAROV, YURI V. BARYSHEV
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Gravitational lens

American Journal of Physics, 1981
A plastic lens is described which will bend light rays parallel to the lens axis in the same way as a static (Schwarzschild) gravitational field. This allows one to observe the optical distortions caused by a (nonrotating) black hole directly. The double-imaging property is discussed with particular application to the recently announced double quasar ...
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Mirages Caused by a Gravitational Lens

1987
Unlike most of the important discoveries reported in astronomy, the physics of gravitational lenses was understood well before their existence was proven. In 1936, Albert Einstein published the results of some calculations concerning the lens effects caused by the gravitational field of a star — the lens — on the light emitted by another star — the ...
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Imaging with a Gravitational Lens

Symposium - International Astronomical Union, 1994
The basic ideas of gravitational microlensing are discussed. Particular attention is given to the use of a gravitational lens as a (non-standard) telescope, to probe the very small scale structure of extragalactic sources. The recovery of information from a gravitational lens telescope is discussed, as well as the unique contribution which can be made ...
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Gravitational Lens Simulator

American Journal of Physics, 1969
Simulated gravitational lens made of Plexiglass for demonstrating stellar gravitational lens phenomena, presenting partial cross ...
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Discovery of a New Gravitational Lens System

Science, 1984
A new gravitational lens system, the triple radio source MG2016+112, has been discovered. Five emission lines at a redshift of 3.2733 ± 0.0014 have been identified in the spectra of two stellar objects of magnitude 22.5 coincident with radio components 3.4 arc seconds apart. The lines are the narrowest ever observed in objects at such a large redshift.
Lawrence, C. R., Schneider, D. P., Schmidt, M., Bennett, C. L., Hewitt, J. N., Burke, B. F., Turner, E. L., Gunn, J. E.   +7 more
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The Discovery of a Gravitational Lens

Scientific American, 1980
A recently discovered, close pair of quasars were surprisingly similar in their characteristics. After rejecting other hypotheses, astronomers suggested that the pair is not a pair at all but two images of a single quasar formed by a gravitational lens, an elliptical galaxy halfway between the quasar and our galaxy. Improved calculations of the effects
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Kerr black hole as a gravitational lens

Physical Review D, 1986
We present approximate solutions to the equations of motion for a ray of light in the Kerr metric which are correct up to and including second-order terms in m/${r}_{\mathrm{min}}$ and a/${r}_{\mathrm{min}}$, where m and a are the Kerr mass and spin, respectively, while ${r}_{\mathrm{min}}$ is the distance of closest approach.
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Gravitational lens optics

2008
© 1989 Springer-Verlag. I thank my collaborators, C. Kochanek, I. Kovner, C. Lawrence, R. Narayan, S. Phinney, and G. Soucail for many discussions on these and related topics. I am indebted to J. Moran for helpful editorial suggestions. Support by the National Science Foundation under NSF grant AST86-15325, the John Simon Guggenheim Foundation, and the
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Gravitational Lens Effect: An Observational Test

Science, 1966
The large proper motion of the nearby star 40 Eridani-A will pass a distant star in 1988. It should be possible to observe the gravitational lens effect of this eclipse by existing photoelectric methods.
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