MTMVMG is claimed to admit stable FLRW perturbations, with the mass-varying scalar as dark energy or inflaton, but stability inequalities are unverified and the phenomenology is fitted.
Massive Graviton on a Spatial Condensate
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In this paper, we consider the spatial gauge symmetries spontaneously break down in GR, and graviton becomes massive on this spatial condensate background. Such model can be considered as a simplest example of massive gravity. We then apply our massive gravity theory to inflation, the graviton mass removes the IR divergence of the inflationary loop diagram.
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Stable Cosmology from Minimal Theory of Mass-Varying Massive Gravity
MTMVMG is claimed to admit stable FLRW perturbations, with the mass-varying scalar as dark energy or inflaton, but stability inequalities are unverified and the phenomenology is fitted.