A novel gravitational lensing feature by wormholes
arXiv:1811.08245 · doi:10.1016/j.physletb.2018.12.030
Abstract
Horizonless compact objects with light rings (or photon spheres) are becoming increasingly popular in recent years for several reasons. In this paper, we show that a horizonless object such as a wormhole of Morris-Thorne type can have two photon spheres. In particular, we show that, in addition to the one present outside a wormhole throat, the throat can itself act as an effective photon sphere. Such wormholes exhibit two sets of relativistic Einstein ring systems formed due to strong gravitational lensing. We consider a previously obtained wormhole solution as a specific example. If such type of wormhole casts a shadow at all, then the inner set of the relativistic Einstein rings will form the outer bright edge of the shadow. Such a novel lensing feature might serve as a distinguishing feature between wormholes and other celestial objects as far as gravitational lensing is concerned.
13 pages, 3 figures, references added, published in PLB
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Cited by in corpus (5)
- Black hole shadow in a general rotating spacetime obtained through Newman-Janis algorithm
- Analytical approach to strong gravitational lensing from ultracompact objects
- Strong gravitational lensing by a strongly naked null singularity
- High energy particle collisions in static, spherically symmetric black-hole-like wormholes
- Possible formation of ring galaxies by torus-shaped magnetic wormholes