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Title: Non-gaussian inflationary shapes in G{sup 3} theories beyond Horndeski

We consider the possible signatures of a recently introduced class of healthy theories beyond Horndeski models on higher-order correlators of the inflationary curvature fluctuation. Despite the apparent large number and complexity of the cubic interactions, we show that the leading-order bispectrum generated by the Generalized Horndeski (also called G{sup 3}) interactions can be reduced to a linear combination of two well known k-inflationary shapes. We conjecture that said behavior is not an accident of the cubic order but a consequence dictated by the requirements on the absence of Ostrogradski instability, the general covariance and the linear dispersion relation in these theories.
Authors:
 [1] ;  [2]
  1. CERCA and Department of Physics, Case Western Reserve University, 10900 Euclid Ave, Cleveland, OH 44106 (United States)
  2. Laboratoire de Physique Théorique et Hautes Energies, Université Pierre and Marie Curie—Paris VI, CNRS-UMR 7589, 4 place Jussieu, 75252 Paris (France)
Publication Date:
OSTI Identifier:
22375822
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; ACCIDENTS; DISPERSION RELATIONS; FLUCTUATIONS; INSTABILITY; INTERACTIONS; SHAPE