[1404.5567] Variable Speed of Light Cosmology, Primordial Fluctuations and BICEP2:
"A variable speed of light cosmology is formulated in which the speed of light is described in the action by a dynamical field ϕ. The initial value problems of cosmology: the horizon and flatness problems are solved. The model predicts primordial scalar and tensor fluctuation spectral indices ns=0.96 and nt=−0.04, respectively. The BICEP2 observation of r=0.2 yields r/nt=−5 which is close to the single field inflationary consistency condition r/nt=−8."
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