Distinguishing between extra natural inflation and natural inflation after BICEP2

Journal Article · Fri Aug 01 00:00:00 EDT 2014 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2014/08/001· OSTI ID:22373423

Kohri, Kazunori ^[1]; Lim, C. S. ^[2]; Lin, Chia-Min ^[3]

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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)

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.

• OSTI ID: 22373423
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2014, Issue 08; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ACCURACY
COMPARATIVE EVALUATIONS
COSMOLOGICAL INFLATION
FLUCTUATIONS
SATELLITES
SCALARS
SPECTRA
TENSORS