2007/01/31 by Wan-Il Park, Ewan D. Stewart
Earth and Planetary Sciences · Physics and Astronomy · #Cosmology and Gravitation Theories #Geophysics and Gravity Measurements #Solar and Space Plasma Dynamics #hep-ph
paper · pdf · doi:10.1103/physrevd.77.023535
published as Phys.Rev.D77:023535,2008 · 11 pages, format changed, some corrections of formulas
arxiv created 2007/06/06 · openalex publication_date 2008/01/31 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We analyze how the spectrum of perturbations produced in a multicomponent modular inflation model proposed by Kadota and Stewart depends on couplings between the two moduli. Although some simple direct couplings give essentially the same results as the original model, dn/dlnk\ensuremath∝n\ensuremath-1, simple indirect couplings produce a power law spectrum, n\ensuremath-1=constant, which can naturally be close to scale invariant.