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Strongly Scale-dependent Non-Gaussianity
Antonio Riotto, Martin S. Sloth
We discuss models of primordial density perturbations where the non-Gaussianity is strongly scale-dependent. In particular, the non-Gaussianity may have a sharp cut-off and be very…
Cosmological diagrammatic rules
Steven B. Giddings, Martin S. Sloth
A simple set of diagrammatic rules is formulated for perturbative evaluation of ``in-in" correlators, as is needed in cosmology and other nonequilibrium problems. These rules are b…
On the Effective Equation of State of Dark Energy
Martin S. Sloth
In an effective field theory model with an ultraviolet momentum cutoff, there is a relation between the effective equation of state of dark energy and the ultraviolet cutoff scale.…
Semiclassical relations and IR effects in de Sitter and slow-roll space-times
Steven B. Giddings, Martin S. Sloth
We calculate IR divergent graviton one-loop corrections to scalar correlators in de Sitter space, and show that the leading IR contribution may be reproduced via simple semiclassic…
Non-Gaussianity from Axion Monodromy Inflation
Steen Hannestad, Troels Haugboelle, Philip R. Jarnhus +1
We study the primordial non-Gaussinity predicted from simple models of inflation with a linear potential and superimposed oscillations. This generic form of the potential is predic…