Testing Hybrid Natural Inflation with BICEP2

Abstract

We analyse Hybrid Natural Inflation in view of the recent results for the tensor index reported by BICEP2. We find that it predicts a large running of the scalar spectrum which is potentially detectable by large scale structure and $21\mathrm{cm}$ observations. The running of the running is also relatively large becoming close to $10^{-2}$. Along the way, we find general consistency relations at which observables are subject if the slow-roll approximation is imposed. Failure to satisfy these equations by the values obtained for the observables in surveys would be a failure of the slow-roll approximation itself.

V3: Published version

References in corpus (10)

• Inflationary Cosmology
• Inflation and the Scale Dependent Spectral Index: Prospects and Strategies
• Can primordial magnetic fields be the origin of the BICEP2 data?
• Probing small-scale cosmological fluctuations with the 21 cm forest: effects of neutrino mass, running spectral index and warm dark matter
• Remarks about the Tensor Mode Detection by the BICEP2 Collaboration and the Super-Planckian Excursions of the Inflaton Field
• Natural Inflation: the status after WMAP 3-year data
• Reconstructing inflationary potential from BICEP2 and running of tensor modes
• BICEP2, the Higgs Mass and the SUSY-breaking Scale
• The Tilt of Primordial Gravitational Waves Spectra from BICEP2
• Constraints on the cosmological parameters from BICEP2, Planck and WMAP

Cited by in corpus (7)

• Modified Lyth bound and implications of BICEP2 results
• Dante's Waterfall
• Constraining Hybrid Natural Inflation with recent CMB data
• General bounds in Hybrid Natural Inflation
• A Permutation on Hybrid Natural Inflation
• Natural Inflation from Polymer Quantization
• False vacuum energy dominated inflation with large $r$ and the importance of ${\kappa }_s$