Perturbations of Nested Branes With Induced Gravity
  We study the behaviour of weak gravitational fields in models where a 4D
brane is embedded inside a 5D brane equipped with induced gravity, which in
turn is embedded in a 6D spacetime. We consider a specific regularization of
the branes internal structures where the 5D brane can be considered thin with
respect to the 4D one. We find exact solutions corresponding to pure tension
source configurations on the thick 4D brane, and study perturbations at first
order around these background solutions. To perform the perturbative analysis,
we adopt a bulk-based approach and we express the equations in terms of gauge
invariant and master variables using a 4D scalar-vector-tensor decomposition.
We then propose an ansatz on the behaviour of the perturbation fields when the
thickness of the 4D brane goes to zero, which corresponds to configurations
where gravity remains finite everywhere in the thin limit of the 4D brane. We
study the equations of motion using this ansatz, and show that they give rise
to a consistent set of differential equations in the thin limit, from which the
details of the internal structure of the 4D brane disappear. We conclude that
the thin limit of the "ribbon" 4D brane inside the (already thin) 5D brane is
well defined (at least when considering first order perturbations around pure
tension configurations), and that the gravitational field on the 4D brane
remains finite in the thin limit. We comment on the crucial role of the induced
gravity term on the 5D brane.
