On Gravitational Lensing by Symmetric and Asymmetric Wormholes
- Authors: Bronnikov K.A.1,2,3, Baleevskikh K.A.2
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Affiliations:
- Center for Gravitation and Fundamental Metrology
- Peoples’ Friendship University of Russia (RUDN University)
- National Research Nuclear University “MEPhI” (Moscow Engineering Physics Institute)
- Issue: Vol 25, No 1 (2019)
- Pages: 44-49
- Section: Article
- URL: https://journals.rcsi.science/0202-2893/article/view/176267
- DOI: https://doi.org/10.1134/S020228931901002X
- ID: 176267
Cite item
Abstract
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.
About the authors
K. A. Bronnikov
Center for Gravitation and Fundamental Metrology; Peoples’ Friendship University of Russia (RUDN University); National Research Nuclear University “MEPhI” (Moscow Engineering Physics Institute)
Author for correspondence.
Email: kb20@yandex.ru
Russian Federation, Ozyornaya ul. 46, Moscow, 119361; ul. Miklukho-Maklaya 6, Moscow, 117198; Moscow
K. A. Baleevskikh
Peoples’ Friendship University of Russia (RUDN University)
Email: kb20@yandex.ru
Russian Federation, ul. Miklukho-Maklaya 6, Moscow, 117198