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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…
Single field consistency relation for the 3-point function
Paolo Creminelli, Matias Zaldarriaga
We point out the existence of a consistency relation involving the 3-point function of scalar perturbations which is valid in any inflationary model, independently of the inflaton…
The shape of non-Gaussianities
Daniel Babich, Paolo Creminelli, Matias Zaldarriaga
We study the dependence on configuration in momentum space of the primordial 3-point function of density perturbations in several different scenarios: standard slow-roll inflation,…
CMB 3-point functions generated by non-linearities at recombination
Paolo Creminelli, Matias Zaldarriaga
We study the 3-point functions generated at recombination in the squeezed triangle limit, when one mode has a wavelength much larger than the other two and is outside the horizon.…