Inflation in generalized unimodular gravity

Abstract

The recently suggested generalized unimodular gravity theory, which was originally put forward as a model of dark energy, can serve as a model of cosmological inflation driven by the effective perfect fluid -- the dark purely gravitational sector of the theory. Its excitations are scalar gravitons which can generate, in the domain free from ghost and gradient instabilities, the red tilted primordial power spectrum of CMB perturbations matching with observations. The reconstruction of the parametric dependence of the action of the theory in the early inflationary Universe is qualitatively sketched from the cosmological data. The alternative possibilities of generating the cosmological acceleration or quantum transition to the general relativistic phase of the theory are also briefly discussed.

arXiv comment13 pages, no figures

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• Restricted Gauge Theory Formalism and Unimodular Gravity
• Generalized unimodular gravity in Friedmann and Kantowski-Sachs universes
• Reconstruction of inflationary scenarios in non-conservative unimodular gravity
• Higgs Inflation in Unimodular Gravity
• Revisiting cosmological diffusion models in Unimodular Gravity and the $H_0$ tension