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UV-extending ghost inflation
Journal article

UV-extending ghost inflation

Abstract

We present a setup that provides a partial UV-completion of the ghost inflation model up to a scale which can be almost as high as the Planck mass. This is achieved by coupling the inflaton to the Lorentz-violating sector described by the Einstein-aether theory or its khronometric version. Compared to previous works on ghost inflation our setup allows to go beyond the study of small perturbations and include the background dynamics in a unified framework. In the specific regime when the expansion of the Universe is dominated by the kinetic energy of the inflaton we find that the model predicts rather high tensor-to-scalar ratio r ∼ 0.02÷0.2 and non-Gaussianity of equilateral type with fNL in the range from -50 to -5.

Authors

Ivanov MM; Sibiryakov S

Journal

Journal of Cosmology and Astroparticle Physics, Vol. 2014, No. 05, pp. 045–045

Publisher

IOP Publishing

Publication Date

May 1, 2014

DOI

10.1088/1475-7516/2014/05/045

ISSN

1475-7516

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