829 citations · 2.8k across the 42 of their papers we have counts for
6 papers · 1 filter
Beyond CDM: Problems, solutions, and the road ahead
Philip Bull, Yashar Akrami, Julian Adamek +37
Despite its continued observational successes, there is a persistent (and growing) interest in extending cosmology beyond the standard model, CDM. This is motivated by a range o…
Generalised matter couplings in massive bigravity
Scott Melville, Johannes Noller
We investigate matter couplings in massive bigravity. We find a new family of such consistent couplings, including and extending known consistent matter couplings, and we investiga…
Strong-coupling scales and the graph structure of multi-gravity theories
James H. C. Scargill, Johannes Noller
In this paper we consider how the strong-coupling scale, or perturbative cutoff, in a multi-gravity theory depends upon the presence and structure of interactions between the diffe…
New massive bigravity cosmologies with double matter coupling
Macarena Lagos, Johannes Noller
We study a previously largely unexplored branch of homogeneous and isotropic background solutions in ghost-free massive bigravity with consistent double matter coupling. For a cert…
On extended symmetries for the Galileon
Johannes Noller, Vishagan Sivanesan, Mikael von Strauss
We investigate a large class of infinitesimal, but fully nonlinear in the field, transformations of the Galileon and search for extended symmetries. The transformations involve pow…
The decoupling limit of Multi-Gravity: Multi-Galileons, Dualities and More
Johannes Noller, James H. C. Scargill
In this paper we investigate the decoupling limit of a particular class of multi-gravity theories, i.e. of theories of interacting spin-2 fields. We explicitly compute the interact…