Deflection angle of light for an observer and source at finite distance
  from a rotating wormhole
  By using a method improved with a generalized optical metric, the deflection
of light for an observer and source at finite distance from a lens object in a
stationary, axisymmetric and asymptotically flat spacetime has been recently
discussed [Ono, Ishihara, Asada, Phys. Rev. D 96, 104037 (2017)]. By using this
method, in the weak field approximation, we study the deflection angle of light
for an observer and source at finite distance from a rotating Teo wormhole,
especially by taking account of the contribution from the geodesic curvature of
the light ray in a space associated with the generalized optical metric. Our
result of the deflection angle of light is compared with a recent work on the
same wormhole but limited within the asymptotic source and observer [Jusufi,
Ovgun, Phys. Rev. D 97, 024042, (2018)], in which they employ another approach
proposed by Werner with using the Nazim's osculating Riemannian construction
method via the Randers-Finsler metric. We show that the two different methods
give the same result in the asymptotic limit. We obtain also the corrections to
the deflection angle due to the finite distance from the rotating wormhole.
