de Sitter quantum loops as the origin of primordial non-Gaussianities

An, Haipeng (Department of Physics, Tsinghua University, Beijing 100084, China) ; Wise, Mark B. (Walter Burke Institute for Theoretical Physics, California Institute of Technology, Pasadena, California 91125, USA) ; Zhang, Zipei (Department of Physics, Tsinghua University, Beijing 100084, China)

15 March 2019

Abstract: It was recently pointed out that in some inflationary models quantum loops containing a scalar of mass m that couples to the inflaton can be the dominant source of primordial non-Gaussianities. We explore this phenomenon in the simplest such model focusing on the behavior of the primordial curvature fluctuations for small m/H. Explicit calculations are done for the three- and four-point curvature fluctuation correlations. Constraints on the parameters of the model from the cosmic microwave background limits on primordial non-Gaussianity are discussed. The bispectrum in the squeezed limit and the trispectrum in the compressed limit are examined. The form of the n-point correlations as any partial sum of wave vectors gets small is determined.

Published in: Physical Review D 99 (2019)
Published by: APS
DOI: 10.1103/PhysRevD.99.056007
License: CC-BY-4.0

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