Screening bulk curvature in the presence of large brane tension
  We study a flat brane solution in an effective 5D action for cascading
gravity and propose a mechanism to screen extrinsic curvature in the presence
of a large tension on the brane. The screening mechanism leaves the bulk
Riemann-flat, thus making it simpler to generalize large extra dimension dark
energy models to higher codimensions. By studying an action with cubic
interactions for the brane-bending scalar mode, we find that the perturbed
action suffers from ghostlike instabilities for positive tension, whereas it
can be made ghost-free for sufficiently small negative tension.
