skip to main content

Title: Planck-suppressed operators

We show that the recent Planck limits on primordial non-Gaussianity impose strong constraints on light hidden sector fields coupled to the inflaton via operators suppressed by a high mass scale Λ. We study a simple effective field theory in which a hidden sector field is coupled to a shift-symmetric inflaton via arbitrary operators up to dimension five. Self-interactions in the hidden sector lead to non-Gaussianity in the curvature perturbations. To be consistent with the Planck limit on local non-Gaussianity, the coupling to any hidden sector with light fields and natural cubic couplings must be suppressed by a very high scale Λ > 10{sup 5}H. Even if the hidden sector has Gaussian correlations, nonlinearities in the mixing with the inflaton still lead to non-Gaussian curvature perturbations. In this case, the non-Gaussianity is of the equilateral or orthogonal type, and the Planck data requires Λ > 10{sup 2}H.
Authors:
;  [1] ;  [2] ;  [3]
  1. D.A.M.T.P., Cambridge University, Cambridge, CB3 0WA (United Kingdom)
  2. Stanford Institute for Theoretical Physics, Stanford University, Stanford, CA 94305 (United States)
  3. Department of Physics, Cornell University, Ithaca, NY 14853 (United States)
Publication Date:
OSTI Identifier:
22369801
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 01; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CORRELATIONS; FIELD THEORIES; INTERACTIONS; LIMITING VALUES; MASS; NONLINEAR PROBLEMS; SYMMETRY