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Inflationary trispectrum from graviton exchange
David Seery, Martin S. Sloth, Filippo Vernizzi
We compute the connected four-point correlation function of the primordial curvature perturbation generated during inflation with standard kinetic terms, where the correlation is e…
The Effective Theory of Quintessence: the w<-1 Side Unveiled
Paolo Creminelli, Guido D'Amico, Jorge Noreña +1
We study generic single-field dark energy models, by a parametrization of the most general theory of their perturbations around a given background, including higher derivative term…
Non-linear isocurvature perturbations and non-Gaussianities
David Langlois, Filippo Vernizzi, David Wands
We study non-linear primordial adiabatic and isocurvature perturbations and their non-Gaussianity. After giving a general formulation in the context of an extended delta N-formalis…
Action approach to cosmological perturbations: the 2nd order metric in matter dominance
Lotfi Boubekeur, Paolo Creminelli, Jorge Norena +1
We study nonlinear cosmological perturbations during the post-inflationary evolution, using the equivalence between a perfect barotropic fluid and a derivatively coupled scalar fie…