Scaleinvariant perturbations from chaotic inflation
Abstract
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 scaleinvariant 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.
 Publication:

Physical Review D
 Pub Date:
 March 2006
 DOI:
 10.1103/PhysRevD.73.063509
 arXiv:
 arXiv:astroph/0512195
 Bibcode:
 2006PhRvD..73f3509B
 Keywords:

 98.80.Cq;
 Particletheory and fieldtheory models of the early Universe;
 Astrophysics;
 High Energy Physics  Phenomenology
 EPrint:
 10 pages, LaTeX with RevTex, no figures