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Standard inflationary models yield a characteristic signature of a primordialpower spectrum with a red tensor and scalar tilt. Nevertheless, Cannone et alrecently suggested that, by breaking the assumption of spatial diffeomorphisminvariance in the context of the effective field theory of inflation, a bluetensor spectrum can be achieved without violating the Null Energy Condition. Inthis context, we explore in which cases a blue tensor tilt can be obtainedalong with a red tilt in the scalar spectrum. Ultimately, we analyze underwhich conditions this model can reproduce the specific consistency relation ofString Gas Cosmology.

Breaking of Spatial Diffeomorphism Invariance, Inflation and the Spectrum of Cosmological Perturbations