Constraining fast-roll inflation
Johannes Noller

TL;DR
This paper investigates the limits of fast-roll inflation models by analyzing their non-Gaussian signatures and employing observational constraints to establish bounds on single field inflation theories.
Contribution
It introduces a method to constrain fast-roll inflation by linking non-Gaussianities to weak-coupling conditions and observational data.
Findings
Fast-roll inflation models produce large, scale-dependent non-Gaussianities.
WMAP data constrains the parameter space of $P(X,\phi)$ inflation models.
Weak-coupling requirements limit the extent of possible deviations from slow-roll inflation.
Abstract
We present constraints on how far single field inflation may depart from the familiar slow-roll paradigm. Considering a fast-roll regime while requiring a (near)-scale-invariant power spectrum introduces large self-interactions for the field and consequently large and scale-dependent non-Gaussianities. Employing this signal, we use the requirement of weak-coupling together with WMAP constraints to derive bounds on generic theories of single field inflation.
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Taxonomy
TopicsCosmology and Gravitation Theories · Solar and Space Plasma Dynamics · Black Holes and Theoretical Physics
