On Gravitational Lensing by Symmetric and Asymmetric Wormholes

We discuss the peculiarities of gravitational lensing by spherically symmetric wormholes if they are not symmetric with respect to their throats. It is noticed, in particular, that wormholes always contain the so-called photon spheres, near which the photon deflection angles can be arbitrarily large...

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Bibliographic Details
Published in:Gravitation & cosmology 2019, Vol.25 (1), p.44-49
Main Authors: Bronnikov, K. A., Baleevskikh, K. A.
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics and Astroparticles
Classical and Quantum Gravitation
Configurations
Deflection
Gravitation
Gravitational lenses
Observations and Techniques
Photons
Physics
Physics and Astronomy
Quantum Physics
Relativity Theory
Throats
Wormholes
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Summary:We discuss the peculiarities of gravitational lensing by spherically symmetric wormholes if they are not symmetric with respect to their throats. It is noticed, in particular, that wormholes always contain the so-called photon spheres, near which the photon deflection angles can be arbitrarily large, but, in general, the throat is such a sphere only for symmetric wormholes. In some cases, photons from outside can cross the throat and return back from a neighborhood of a photon sphere if the latter is located beyond the throat. Two families of generally asymmetric wormhole configurations are considered as examples: (1) anti-Fisher wormholes with a massless phantom scalar field as a source of gravity, and (2) wormholes with a zero Ricci scalar that may be interpreted as vacuum configurations in a brane world. The photon effective potentials and deflection angles for them are found and discussed.
ISSN:0202-2893
1995-0721
DOI:10.1134/S020228931901002X