Wormhole Shadows in Rotating Dust
  As an extension of our previous work, which investigated the shadows of the
Ellis wormhole surrounded by nonrotating dust, in this paper we study wormhole
shadows in rotating dust flow. First, we derive steady-state solutions of
slowly rotating dust surrounding the wormhole by solving relativistic Euler
equations. Solving null geodesic equations and radiation transfer equations, we
investigate the images of the wormhole surrounded by dust for the above
steady-state solutions. Because the Ellis wormhole spacetime possesses unstable
circular orbits of photons, a bright ring appears in the image, just as in
Schwarzschild spacetime. The bright ring looks distorted due to rotation. Aside
from the bright ring, there appear weakly luminous complex patterns by the
emission from the other side of the throat. These structure could be detected
by high-resolution very-long-baseline-interferometry observations in the near
future.
