Scale-invariant perturbations from chaotic inflation

@article{Byrnes2006ScaleinvariantPF,
  title={Scale-invariant perturbations from chaotic inflation},
  author={Christian T. Byrnes and David Wands},
  journal={Physical Review D},
  year={2006},
  volume={73},
  pages={063509}
}
Vacuum fluctuations in the inflaton field driving chaotic inflation with a quadratic potential give a red spectrum of primordial density perturbations, n=0.97. However angular fluctuations in an O(N)-symmetric quadratic potential have a very nearly scale-invariant spectrum, n=0.9998. We investigate the possibility that these isocurvature field perturbations could give the dominant contribution to the primordial density perturbation after inflation. 
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