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2016

Dark Energy and Doubly Coupled Bigravity

Brax, Philippe, Davis, Anne-Christine, Noller, Johannes

Understand

We analyse the late time cosmology and the gravitational properties of doubly coupled bigravity in the constrained vielbein formalism (equivalent to the metric formalism) when the mass of the massive graviton is of the order of the present Hubble rate.

We focus on one of the two branches of background cosmology where the ratio between the scale factors of the two metrics is algebraically determined.
The Universe evolves from a matter dominated epoch to a dark energy dominated era where the equation of state of dark energy can always be made close to -1 now by appropriately tuning the graviton mass.
We also analyse the perturbative spectrum of the theory in the quasi static approximation well below the strong coupling scale where no instability is present and we show that there are five scalar degrees of freedom, two vectors and two gravitons.