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Non-Gaussianity from Features

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arxiv 1905.12140 v2 pith:ORWTGEZ5 submitted 2019-05-29 gr-qc astro-ph.CO

S. Basu , D. J. Brooker , N. C. Tsamis , R. P. Woodard This is my paper · ORCID
classification gr-qcastro-ph.CO
keywords featuresnon-gaussianityaccuratelyadsheadanalyticapproximationassociatedcompare
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The strongest non-Gaussianity in single-scalar potential models of inflation is associated with features in the power spectrum. We stress the importance of accurately modelling the expected signal in order for the standard estimator to minimize contamination by random noise. We present explicit formulae which improve on the approximation introduced by Adshead, Hu, Dvorkin and Peiris. We also compare with a simple, analytic model of the first feature, and quantify our results using the correlators of Hung, Fergusson and Shellard.

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  1. The Inflaton Effective Potential for General $\epsilon$

    gr-qc 2019-08 conditional novelty 7.0 of 10

    The one-loop inflaton effective potential in a general slow-roll FRW background depends locally on H and ε with a residual nonlocal contribution, and the Friedmann equations are generalized to actions depending on H and ε.

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