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Title: New natural shapes of non-Gaussianity from high-derivative interactions and their optimal limits from WMAP 9-year data

Given the fantastic experimental effort, it is important to thoroughly explore the signature space of inflationary models. The fact that higher derivative operators do not renormalize lower derivative ones allows us to find a large class of technically natural single-clock inflationary models where, in the context of the Effective Field Theory of Inflation, the leading interactions have many derivatives. We systematically explore the 3-point function induced by these models and their overlap with the standard equilateral and orthogonal templates. We find that in order to satisfactorily cover the signature space of these models, two new additional templates need to be included. We then perform the optimal analysis of the WMAP 9-year data for the resulting four templates, finding that the overall significance of a non-zero signal is between 2–2.5σ, depending on the choice of parameter space, partially driven by the preference for nonzero f{sub NL}{sup orth} in WMAP9.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Physics Department, Boston University, Boston, MA 02215 (United States)
  2. School of Natural Sciences, Institute for Advanced Study, Princeton, NJ 08540 (United States)
  3. Stanford Institute for Theoretical Physics, Stanford University, Stanford, CA 94306 (United States)
  4. Perimeter Institute for Theoretical Physics, Waterloo, ON N2L 2Y5 (Canada)
Publication Date:
OSTI Identifier:
22375743
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 11; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COSMOLOGICAL INFLATION; FIELD THEORIES; FUNCTIONS; INTERACTIONS; RENORMALIZATION; SHAPE; SIGNALS; SPACE