Gravitational Lensing by Phantom Black holes
  In some models dark energy is described by phantom scalar fields (scalar
fields with "wrong" sign of the kinetic term in the lagrangian). In the current
paper we study the effect of phantom scalar field and/or phantom
electromagnetic field on gravitational lensing by black holes in the strong
deflection regime. The black-hole solutions that we have studied have been
obtained in the frame of the Einstein-(anti-)Maxwell-(anti-)dilaton theory. The
obtained results show considerable effect of the phantom scalar and
electromagnetic fields on the angular position, brightness and separation of
the relativistic images.
