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• W2900691444 abstract "We discuss the cosmological phenomenology of biscalar-tensor models displaying a maximally symmetric Einstein-frame kinetic sector and constructed on the basis of scale symmetry and volume-preserving diffeomorphisms. These theories contain a single dimensionful parameter ${mathrm{ensuremath{Lambda}}}_{0}$---associated with the invariance under the aforementioned restricted coordinate transformations---and a massless dilaton field. At large field values these scenarios lead to inflation with no generation of isocurvature perturbations. The corresponding predictions depend only on two dimensionless parameters, which characterize the curvature of the field manifold and the leading-order behavior of the inflationary potential. For ${mathrm{ensuremath{Lambda}}}_{0}=0$ the scale symmetry is unbroken and the dilaton admits only derivative couplings to matter, evading all fifth-force constraints. For ${mathrm{ensuremath{Lambda}}}_{0}ensuremath{ne}0$ the field acquires a runaway potential that can support a dark-energy-dominated era at late times. We confront a minimalistic realization of this appealing framework with observations using a Markov chain Monte Carlo approach, with likelihoods from present baryon acoustic oscillation, type Ia supernova, and cosmic microwave background data. A Bayesian model comparison indicates a preference for the considered model over $mathrm{ensuremath{Lambda}}mathrm{CDM}$, under certain assumptions for the priors. The impact of possible consistency relations among the early and late Universe dynamics that can appear within this setting is discussed with the use of correlation matrices. The results indicate that a precise determination of the inflationary observables and the dark energy equation of state could significantly constrain the model parameters." @default.
• W2900691444 created "2018-11-29" @default.
• W2900691444 creator A5005438006 @default.
• W2900691444 creator A5054593446 @default.
• W2900691444 creator A5078936833 @default.
• W2900691444 creator A5090663618 @default.
• W2900691444 date "2019-03-12" @default.
• W2900691444 modified "2023-10-14" @default.
• W2900691444 title "Scale-invariant alternatives to general relativity. III. The inflation-dark energy connection" @default.
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