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Title: On degenerate models of cosmic inflation

In this article we discuss the role of current and future CMB measurements in pinning down the model of inflation responsible for the generation of primordial curvature perturbations. By considering a parameterization of the effective field theory of inflation with a modified dispersion relation arising from heavy fields, we derive the dependence of cosmological observables on the scale of heavy physics Λ{sub UV}. Specifically, we show how the f{sub NL} non-linearity parameters are related to the phase velocity of curvature perturbations at horizon exit, which is parameterized by Λ{sub UV}. BICEP2 and PLANCK findings are shown to be consistent with a value Λ{sub UV} ∼ Λ{sub GUT}. However, we find a degeneracy in the parameter space of inflationary models that can only be resolved with a detailed knowledge of the shape of the non-Gaussian bispectrum.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Max-Planck-Institut für Gravitationsphysik, Albert-Einstein-Institut, Am Mühlenberg 1, D-14476 Potsdam (Germany)
  2. Physics Department, FCFM, Universidad de Chile, Blanco Encalada 2008, Santiago (Chile)
  3. Department of Physics, King's College London, Strand, London WC2R 2LS (United Kingdom)
  4. Asia Pacific Center for Theoretical Physics (APCTP), Pohang 790-784 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22375849
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 10; 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; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMOLOGICAL INFLATION; DISPERSION RELATIONS; FIELD THEORIES; INFLATIONARY UNIVERSE; MATHEMATICAL SPACE; PERTURBATION THEORY; PHASE VELOCITY; SHAPE