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2015

Consistency relations for sharp features in the primordial spectra

Mooij, Sander, Palma, Gonzalo A., Panotopoulos, Grigoris et al.

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We study the generation of sharp features in the primordial spectra within the framework of effective field theory of inflation, wherein curvature perturbations are the consequence of the dynamics of a single scalar degree of freedom.

We identify two sources in the generation of features: rapid variations of the sound speed c_s (at which curvature fluctuations propagate) and rapid variations of the expansion rate H during inflation.
With this in mind, we propose a non-trivial relation linking these two quantities that allows us to study the generation of sharp features in realistic scenarios where features are the result of the simultaneous occurrence of these two sources.
This relation depends on a single parameter with a value determined by the particular model (and its numerical input) responsible for the rapidly varying background.

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