Compact and extended objects from self-interacting phantom fields
  In this work we investigate localized and extended objects for gravitating, self-interacting phantom fields. The phantom fields come from two scalar fields with a "wrong sign" (negative) kinetic energy term in the Lagrangian. This study covers several solutions supported by these phantom fields: phantom balls, traversable wormholes, phantom cosmic strings, and "phantom" domain walls. These four systems are solved numerically and we try to draw out general, interesting features in each case. 
Vladimir Dzhunushaliev, Vladimir Folomeev, Arislan Makhmudov, Ainur   Urazalina, Douglas Singleton, and John Scott
gr-qc hep-th