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Title: Distinguishing between extra natural inflation and natural inflation after BICEP2

In this paper, we carefully calculated the tensor-to-scalar ratio, the running spectral index, and the running of running spectrum for (extra) natural inflation in order to compare with recent BICEP2 data, PLANCK satellite data and future 21 cm data. We discovered that the prediction for running spectral index and the running of running spectrum in natural inflation is different from that in the case of extra natural inflation. Near future observation for the running spectral index can only provide marginal accuracy which may not allow us distinguishing between extra natural inflation from natural inflation clearly unless the experimental accuracy can be further improved.
Authors:
 [1] ;  [2] ;  [3]
  1. Cosmophysics Group, Theory Center, IPNS KEK, and The Graduate University for Advanced Studies (Sokendai), 1-1 Oho, Tsukuba 305-0801 (Japan)
  2. Department of Mathematics, Tokyo Woman's Christian University, Tokyo 167-8585 (Japan)
  3. Department of Physics, Chuo University, Bunkyo-ku, Tokyo 112 (Japan)
Publication Date:
OSTI Identifier:
22373423
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 08; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCURACY; COMPARATIVE EVALUATIONS; COSMOLOGICAL INFLATION; FLUCTUATIONS; SATELLITES; SCALARS; SPECTRA; TENSORS