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Journal of High Energy Physics

, 2014:151

First Online: 23 December 2014Received: 10 October 2014Revised: 02 December 2014Accepted: 04 December 2014 Abstract

We propose a class of scalar models that, once coupled to gravity, lead to cosmologies that smoothly and stably connect an inflationary quasi-de Sitter universe to a low, or even zero-curvature, maximally symmetric spacetime in the asymptotic past, strongly violating the null energy condition \ \left\overset{\cdot }{H}\gg {H}^2 ight \ at intermediate times. The models are deformations of the conformal galileon lagrangian and are therefore based on symmetries, both exact and approximate, that ensure the quantum robustness of the whole picture. The resulting cosmological backgrounds can be viewed as regularized extensions of the galilean genesis scenario, or, equivalently, as ‘early-time-complete’ realizations of inflation. The late-time inflationary dynamics possesses phenomenologically interesting properties: it can produce a large tensor-to-scalar ratio within the regime of validity of the effective field theory and can lead to sizeable equilateral nongaussianities.

KeywordsCosmology of Theories beyond the SM Classical Theories of Gravity Effective field theories ArXiv ePrint: 1410.0882

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Author: David Pirtskhalava - Luca Santoni - Enrico Trincherini - Patipan Uttayarat


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