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Title: Composite inflation confronts BICEP2 and PLANCK

We examine observational constraints on single-field inflation in which the inflaton is a composite field stemming from a four-dimensional strongly interacting field theory. We confront the predictions with the Planck and very recent BICEP2 data. In the large non-minimal coupling regions, we discover for the minimal composite inflationary model that the predictions lie well inside the joint 68% CL for the Planck data, but is in tension with the recent BICEP2 observations. In the case of the glueball inflationary model, the predictions satisfy the Planck results. However, this model can produce a large tensor-to-scalar ratio consistent with the recent BICEP2 observations if the number of e-foldings is slightly smaller than the range commonly used. For a super Yang-Mills paradigm, we discover that the predictions satisfy the Planck data, and surprisingly a large tensor-to-scalar ratio consistent with the BICEP2 results can also be produced for an acceptable range of the number of e-foldings and of the confining scale. In the small non-minimal coupling regions, all of the models can satisfy the BICEP2 results. However, the predictions of the glueball and superglueball inflationary models cannot satisfy the observational bound on the amplitude of the curvature perturbation launched by Planck, and the techni-inflatonmore » self-coupling in the minimal composite inflationary model is constrained to be extremely small.« less
Authors:
 [1] ;  [2]
  1. The Institute for Fundamental Study, Naresuan University, Phitsanulok 65000 (Thailand)
  2. School of Science, Walailak University, 222 Thaiburi, Thasala District, Nakhon Si Thammarat, 80161 (Thailand)
Publication Date:
OSTI Identifier:
22373504
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 06; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; COUPLING; DISTURBANCES; FIELD THEORIES; FORECASTING; FOUR-DIMENSIONAL CALCULATIONS; GLUEBALLS; PERTURBATION THEORY; SCALARS; TENSORS; YANG-MILLS THEORY