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The Effective Field Theory of Inflation
Clifford Cheung, Paolo Creminelli, A. Liam Fitzpatrick +2
We study the effective field theory of inflation, i.e. the most general theory describing the fluctuations around a quasi de Sitter background, in the case of single field models.…
Perturbations in bouncing cosmologies: dynamical attractor vs scale invariance
Paolo Creminelli, Alberto Nicolis, Matias Zaldarriaga
For bouncing cosmologies such as the ekpyrotic/cyclic scenarios we show that it is possible to make predictions for density perturbations which are independent of the details of th…
Pseudonatural Inflation
Nima Arkani-Hamed, Hsin-Chia Cheng, Paolo Creminelli +1
We study how to obtain a sufficiently flat inflaton potential that is natural from the particle physics point of view. Supersymmetry, which is broken during inflation, cannot prote…
Extranatural Inflation
Nima Arkani-Hamed, Hsin-Chia Cheng, Paolo Creminelli +1
We present a new model of inflation in which the inflaton is the extra component of a gauge field in a 5d theory compactified on a circle. The chief merit of this model is that the…