Phys. Rev. D 73, 063509 (2006) [8 pages]Scale-invariant perturbations from chaotic inflationReceived 5 January 2006; published 10 March 2006 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. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.73.063509
DOI:
10.1103/PhysRevD.73.063509
PACS:
98.80.Cq
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