On the shadow of rotating traversable wormholes

Understand

We revisit the shadow of rotating traversable wormholes discussing the role of the wormhole throat in the shadow formation.

• For certain classes of wormholes the throat serves as a potential barrier for light rays with particular impact parameters, thus modifying the shadow shape.
• We consider a couple of wormhole solutions and examine the structure of their shadow images, and the intrinsic mechanisms for their formation.
• Some of the shadows possess cuspy edges, which arise due to the interplay of two distinct families of unstable spherical orbits.