Speaker
Sergey Sibiryakov
(CERN & EPFL)
Description
We present a setup that provides a 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 ~ 0.1 and
non-Gaussianity of equilateral type with f_NL ~ -40.
Primary author
Sergey Sibiryakov
(CERN & EPFL)
Co-author
Mikhail Ivanov
(Moscow State University)
