Cosmology in doubly coupled massive gravity: constraints from SNIa, BAO
  and CMB
  Massive gravity in the presence of doubly coupled matter field via en
effective composite metric yields an accelerated expansion of the universe. It
has been recently shown that the model admits stable de Sitter attractor
solutions and could be used as a dark energy model. In this work, we perform a
first analysis of the constraints imposed by the SNIa, BAO and CMB data on the
massive gravity model with the effective composite metric and show that all the
background observations are mutually compatible at the one sigma level with the
model.
