A minimal sub-Planckian axion inflation model with large tensor-to-scalar ratio
- Dept. of Physics, University of Lancaster, Lancaster LA1 4YB (United Kingdom)
We present a minimal axion inflation model which can generate a large tensor-to-scalar ratio while remaining sub-Planckian. The modulus of a complex scalar field Φ with a λ|Φ|{sup 4} potential couples directly to the gauge field of a strongly-coupled sector via a term of the form (|Φ|/M{sub Pl}){sup m}F F-tilde . This generates a minimum of the potential which is aperiodic in the phase. The resulting inflation model is equivalent to a φ{sup 4/(m+1)} chaotic inflation model. For the natural case of a leading-order portal-like interaction of the form Φ{sup †}ΦF F-tilde , the model is equivalent to a φ{sup 4/3} chaotic inflation model and predicts a tensor-to-scalar ratio r = 16/3N = 0.097 and a scalar spectral index n{sub s} = 1 - 5/3N = 0.970. The value of |Φ| remains sub-Planckian throughout the observable era of inflation, with |Φ| ∼< 0.01M{sub Pl} for N ∼< 60 when λ ∼ 1.
- OSTI ID:
- 22382030
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2015, Issue 01; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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