http://arxiv.org/abs/1402.1988
We discuss a particularly simple example of a bimetric massive gravity model which seems to offer a valid alternative to the standard cosmological model. Just like $\Lambda$CDM, it depends on a single parameter, has an analytical background expansion law and fits well the expansion cosmological data and the linear perturbation observations. Nevertheless, it is well distinguishable from $\Lambda$CDM: its equation of state is $w(z)\approx-1.22_{-0.02}^{+0.02}-0.64_{-0.04}^{+0.05}z/(1+z)$ for small redshifts and its growth index is approximately $\gamma=0.47$. The predicted sensitivity of planned cosmological observations is more than sufficient to distinguish this minimal bimetric model from $\Lambda$CDM.
F. Konnig and L. Amendola
Tue, 11 Feb 14
6/55
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