Combining cosmological and local bounds on bimetric theory
  Ghost-free bimetric theory describes two nonlinearly interacting spin-2
fields, one massive and one massless, thus extending general relativity. We
confront bimetric theory with observations of Supernovae type 1a, Baryon
Acoustic Oscillations and the Cosmic Microwave Background in a statistical
analysis, utilising the recently proposed physical parametrisation. This
directly constrains the physical parameters of the theory, such as the mass of
the spin-2 field and its coupling to matter. We find that all models under
consideration are in agreement with the data. Next, we compare these results to
bounds from local tests of gravity. Our analysis reveals that all two- and
three-parameter models are observationally consistent with both cosmological
and local tests of gravity. The minimal bimetric model (only $\beta_1$) is
ruled out by our combined analysis.
