Non-gaussianity in axion N-flation models: detailed predictions and mass spectra

Liddle, Andrew R, Kim, Soo A and Seery, David (2012) Non-gaussianity in axion N-flation models: detailed predictions and mass spectra. Physical Review D, 85. 023532. ISSN 1550-7998

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Abstract

We have recently shown that multi-field axion N-flation can lead to observable non-gaussianity in much of its parameter range, with the assisted inflation mechanism ensuring that the density perturbations are sufficiently close to scale invariance. In this paper we extend our analysis in several directions. In the case of equal-mass axions, we compute the probability distributions of observables and their correlations across the parameter space. We examine the case of unequal masses, and show that the mass spectrum must be very densely packed if the model is to remain in agreement with observations. The model makes specific testable predictions for all major perturbative observables, namely the spectral index, tensor-to-scalar ratio, bispectrum, and trispectrum.

Item Type: Article
Additional Information: Author list in alphabetical order
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QB Astronomy > QB0980 Cosmogony. Cosmology
Depositing User: David Seery
Date Deposited: 08 Sep 2014 09:38
Last Modified: 08 Mar 2017 08:44
URI: http://sro.sussex.ac.uk/id/eprint/19507

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