Scale-invariant perturbations from chaotic inflation

2005/12/07 by Christian T. Byrnes, David Wands · 2 citations
Earth and Planetary Sciences · Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Geophysics and Gravity Measurements #astro-ph #hep-ph

paper · pdf · doi:10.1103/physrevd.73.063509

published as Phys.Rev.D73:063509,2006 · 10 pages, LaTeX with RevTex, no figures

arxiv created 2005/12/07 · openalex publication_date 2006/03/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01

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 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.

Citations

• Non-Gaussian features of primordial fluctuations in single field inflationary models
• Non-Gaussianity from Inflation: Theory and Observations
• Cosmological perturbation with two scalar fields in reheating after inflation
• Cosmological parameter analysis including SDSS Lyαforest and galaxy bias: Constraints on the primordial spectrum of fluctuations, neutrino mass, and dark energy
• A General Analytic Formula for the Spectral Index of the Density Perturbations produced during Inflation

Cited by

• Generation of perturbation after multi-field inflation
• Perturbation spectra of “N-flation”