UV-extending ghost inflation

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 similar to 0.02 divided by 0.2 and non-Gaussianity of equilateral type with f(NL), in the range from -50 to -5.


Published in:
Journal Of Cosmology And Astroparticle Physics, 5
Year:
2014
Publisher:
Bristol, Iop Publishing Ltd
ISSN:
1475-7516
Keywords:
Laboratories:




 Record created 2014-10-23, last modified 2018-03-17


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