Cascading Gravity is Ghost Free
  We perform a full perturbative stability analysis of the 6D cascading gravity
model in the presence of 3-brane tension. We demonstrate that for sufficiently
large tension on the (flat) 3-brane, there are no ghosts at the perturbative
level, consistent with results that had previously only been obtained in a
specific 5D decoupling limit. These results establish the cascading gravity
framework as a consistent infrared modification of gravity.
