de Sitter Branes in a Flat Bulk of Massive Gravity
  We construct de Sitter branes in a flat bulk of massive gravity in $5D$. We
find two branches of solutions, reminiscent of the normal and self-accelerating
branches in DGP, but with rather different properties. Neither branch has a
self-accelerating limit: the background geometry requires having a nonvanishing
tension. On the other hand, on both branches there are sub-branches where the
leading order contributions of the tension to the curvature cancel. In these
cases it turns out that larger tensions curve the background less. Further,
both branches support a localized $4D$ massless graviton for a special choice
of bulk mass terms. This choice may be protected by enhanced gauge symmetry at
least at the linearized level. Finally, we generalize the solutions to the case
of bigravity in a flat $5D$ bulk.
