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Gravitational Lensing in Astronomy
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Deflection of light by gravity was predicted by General Relativity and observationaly confirmed in 1919. In the following decades various aspects of the gravitational lens effect were explored theoretically, among them the possibility of multiple or ring-like images of background sources, the use of lensing as a gravitational telescope on very faint and distant objects, and the possibility to determine Hubble's constant with lensing. Only relatively recently gravitational lensing became an observational science after the discovery of the first doubly imaged quasar in 1979. Today lensing is a booming part of astrophysics. In addition to multiply-imaged quasars, a number of other aspects of lensing have been discovered since, e.g. giant luminous arcs, quasar microlensing, Einstein rings, galactic microlensing events, arclets, or weak gravitational lensing. By now literally hundreds of individual gravitational lens phenomena are known. Although still in its childhood, lensing has established itself as a very useful astrophysical tool with some remarkable successes. It has contributed significant new results in areas as different as the cosmological distance scale, the large scale matter distribution in the universe, mass and mass distribution of galaxy clusters, physics of quasars, dark matter in galaxy halos, or galaxy structure.
Forward citations
Cited by 5 Pith papers
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Gravitational Lensing in a Kasner Background: Distinguishing Wormholes and Black Holes
In a Kasner (anisotropic) universe, wormhole and black-hole lenses produce different directional splits of the Einstein-like scale, while the full critical curves remain nearly circular.
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Hawking Radiation in $f(\mathcal{R})$ Gravity: Survival of lighter black holes
Non-rotating black holes in the studied f(R) model can survive to the present day down to masses ~5×10^13 g (for large |B|), roughly ten times lighter than the GR threshold.
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Picolensing as a Probe of Primordial Black Hole Dark Matter
Asteroid-mass primordial black hole dark matter could be probed by picolensing of gamma-ray bursts, but only with detector separations of at least Earth-L2 distance once realistic GRB size uncertainties are included.
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A class of charged-Taub-NUT-scalar metrics via Harison and Ehlers Transformations
A proposed new family of charged Taub-NUT spacetimes with a theta-dependent scalar field, built via Harrison and Ehlers transformations, but the exact-solution claim is unsupported and internally inconsistent.
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Astrophysical environment around a black hole in the braneworld and its optical signatures
Braneworld quadratic and nonlocal corrections weaken gravity in anisotropic Einstein-cluster environments around black holes, blocking horizon formation and shifting Einstein-ring and shadow radii in ways that may con...
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