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Chronology Protection in Galileon Models and Massive Gravity
Clare Burrage, Claudia de Rham, Lavinia Heisenberg +1
Galileon models are a class of effective field theories that have recently received much attention. They arise in the decoupling limit of theories of massive gravity, and in some c…
On Black Holes in Massive Gravity
L. Berezhiani, G. Chkareuli, C. de Rham +2
In massive gravity the so-far-found black hole solutions on Minkowski space happen to convert horizons into a certain type of singularities. Here we explore whether these singulari…
Mode Spectrum of the Electromagnetic Field in Open Universe Models
Julian Adamek, Claudia de Rham, Ruth Durrer
We examine the mode functions of the electromagnetic field on spherically symmetric backgrounds with special attention to the subclass which allows for the foliation as open Friedm…
Massive Cosmologies
G. D'Amico, C. de Rham, S. Dubovsky +3
We explore the cosmological solutions of a recently proposed extension of General Relativity with a Lorentz-invariant mass term. We show that the same constraint that removes the B…
Helicity Decomposition of Ghost-free Massive Gravity
Claudia de Rham, Gregory Gabadadze, Andrew J. Tolley
We perform a helicity decomposition in the full Lagrangian of the class of Massive Gravity theories previously proven to be free of the sixth (ghost) degree of freedom via a Hamilt…
Comments on (super)luminality
Claudia de Rham, Gregory Gabadadze, Andrew J. Tolley
Recently, in an interesting work arXiv:1106.3972 a solution of the equations of motion of massive gravity was discussed, and it was shown that one of the fluctuations on that solut…