2000/02/29 by Helen A. Bridgman, David Wands · 8 citations
Chemistry · Physics and Astronomy · #Algorithm #Analytical Chemistry (journal) #Chemistry #Computer science #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Database #Galaxies: Formation, Evolution, Phenomena #Physics #hep-ph #hep-th
paper · pdf · doi:10.1103/physrevd.61.123514
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 61(12) (American Physical Society) · 8 pages, 3 figures, revtex plus epsf, minor typos corrected, version to appear in Physical Review D
arxiv created 2000/04/13 · openalex publication_date 2000/05/26 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We investigate four-dimensional cosmological vacuum solutions derived from an effective action invariant under global SL(n,R) transformations. We find the general solutions for linear axion field perturbations about homogeneous dilaton-moduli-vacuum solutions for an SL(4,R)-invariant action and find the spectrum of super-horizon perturbations resulting from vacuum fluctuations in a pre-big-bang scenario. We show that for SL(n,R)-invariant actions with n>~4 there exists a regime of parameter space of non-zero measure where all the axion field spectra have positive spectral tilt, as required if light axion fields are to provide a seed for anisotropies in the microwave background and large-scale structure in the universe.