UV-extending Ghost Inflation
arXiv:1402.4964 · doi:10.1088/1475-7516/2014/05/045
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 f_NL in the range from -50 to -5.
30 pages, 1 figure; the predicted range of observables explicitly indicated in the abstract, footnote on the BICEP2 results added; version to be published in JCAP
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- Magnon Inflation: Slow Roll with Steep Potentials
- Testing Lorentz invariance of dark matter with satellite galaxies
- Non-Gaussianity after BICEP2
- Constraints on Single-Field Inflation
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- Moduli Dynamics in Effective Nested Warped Geometry in Four Dimensions and Some Cosmological Implications
- Cosmological constraints on Lorentz Invariance violation in gravity and dark matter
- Weakly Broken Galileon Symmetry in Cosmology