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Similar

K. Freese, C. Savage and W. H. Kinney, Int. J. Mod. Phys. D 16
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K. Kohri, D. H. Lyth and A. Melchiorri, JCAP 0804
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2014

Constraining Hybrid Natural Inflation with recent CMB data

Vazquez, J. Alberto, Carrillo-Gonzalez, Mariana, German, Gabriel et al.

Understand

We study the Hybrid Natural Inflation (HNI) model and some of its realisations in the light of recent CMB observations, mainly Planck temperature and WMAP-9 polarization, and compare with the recent release of BICEP2 dataset.

The inflationary sector of HNI is essentially given by the potential $V(\phi) = V_0(1+a\cos (\frac{\phi}{f} ) )$, where $a$ is a positive constant smaller or equal to one and $f$ is the scale of (pseudo Nambu-Goldstone) symmetry breaking.
We show that to describe the HNI model realisations we only need two observables; the spectral index $n_s$, the tensor-to-scalar ratio, and a free parameter in the amplitude of the cosine function $a$.
We find that in order to make the HNI model compatible with the BICEP2 observations, we require a large positive running of the spectra.

Built on

A.H. Guth, Phys. Rev. D23
1981
Earlier work this paper cites.
A.D Linde, Phys. Lett. B108
1982
Earlier work this paper cites.
A. Albrecht and P.J. Steinhardt, Phys. Rev. Lett. 48
1982
Earlier work this paper cites.
K. Freese, J. A. Frieman and A. V. Olinto, Phys. Rev. Lett. 65
1990
Earlier work this paper cites.
F. Adams, J.R. Bond, K. Freese, J. A. Frieman and A. V. Olinto, Phys. Rev. D47
1993
Earlier work this paper cites.
A. R. Liddle, P. Parsons and J. D. Barrow, Phys. Rev. D 50
1994
Earlier work this paper cites.
B. J. Carr, J. H. Gilbert and J. E. Lidsey, Phys. Rev. D 50
1994
Earlier work this paper cites.
A. R. Liddle and D. H. Lyth, Cosmological Inflation and Large-Scale Structure
2000
Earlier work this paper cites.
A. Lewis, A. Challinor and A. Lasenby, Astrophys. J. 538
2000
Earlier work this paper cites.
A. Lewis and S. Bridle Phys. Rev. D, 66
2002
Earlier work this paper cites.
A. G. Polnarev and I. Musco, Class. Quant. Grav. 24
2007
Earlier work this paper cites.