Generalized unimodular gravity can produce a nearly flat, red-tilted primordial spectrum matching observations, with inflation driven solely by a scalar graviton.
The action of this theory follows from the Einstein-Hilbert action SEH[gµν ] by the substitution of the kinematical restriction (1.1)
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Inflation in generalized unimodular gravity
Generalized unimodular gravity can produce a nearly flat, red-tilted primordial spectrum matching observations, with inflation driven solely by a scalar graviton.