Licentiate Thesis: Consistent Nonlinear Interactions for the Graviton
Monday 28 May 2012
to 15:15 at
Angnis Schmidt-May (Stockholm University, Department of Physics)
This thesis investigates various aspects of massive gravity and bimetric gravity which belong to a certain
class of modifications of general relativity. It provides an introduction to linear massive gravity in flat
backgrounds, before reviewing the construction of consistent nonlinear massive gravity that avoids the
Boulware-Deser ghost instability. We discuss the structure of the ghost-free action and summarize the
consistency proofs for massive gravity in arbitrary backgrounds, using two different formulations.
Thereafter we recapitulate the generalization of massive gravity to consistent bimetric models of gravity, in
which we then solve the equations of motion with a homogeneous, isotropic ansatz and discuss the
implications for cosmology.