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

journal contribution
posted on 2023-06-07, 22:10 authored by Andrew R Liddle, Soo A Kim, David SeeryDavid Seery
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.

History

Publication status

  • Published

File Version

  • Published version

Journal

Physical Review D

ISSN

1550-7998

Publisher

American Physical Society

Volume

85

Page range

023532

Department affiliated with

  • Physics and Astronomy Publications

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Author list in alphabetical order

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2014-09-08

First Compliant Deposit (FCD) Date

2014-09-07

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