Light curves of light rays passing through a wormhole
Naoki Tsukamoto, Tomohiro Harada

TL;DR
This paper analyzes the light curves of rays passing through wormholes, demonstrating that such curves are distinguishable from microlensing events but similar to retrolensing, providing insights into the topological structure of these objects.
Contribution
The study develops a method to analyze light curves passing through traversable wormholes, specifically the Ellis wormhole, and compares them with black hole and other wormhole models.
Findings
Light curve passing through Ellis wormhole's throat is distinguishable from microlensing.
Light curve is similar to retrolensing due to large deflection angles.
Qualitative similarity of light curves suggests common features among traversable wormholes.
Abstract
Gravitational lensing is a good probe into the topological structure of dark gravitating celestial objects. In this paper, we investigate the light curve of a light ray that passes through the throat of an Ellis wormhole, the simplest example of traversable wormholes. The method developed here is also applicable to other traversable wormholes. To study whether the light curve of a light ray that passes through a wormhole throat is distinguishable from that which does not, we also calculate light curves without the passage of a throat for an Ellis wormhole, a Schwarzschild black hole, and an ultrastatic wormhole with the spatial geometry identical to that of the Schwarzschild black hole in the following two cases: (i) "microlensing," where the source, lens, and observer are almost aligned in this order and the light ray starts at the source, refracts in the weak gravitational field of…
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