2011/11/30 by Ian Huston, Adam J. Christopherson
Earth and Planetary Sciences · Physics and Astronomy · #Cosmology and Gravitation Theories #Geophysics and Gravity Measurements #Solar and Space Plasma Dynamics #astro-ph.CO #gr-qc #hep-th
paper · pdf · doi:10.1103/physrevd.85.063507
published as Phys. Rev. D 85, 063507 (2012) · v2: Typos fixed, references and comments added; v1: 8 pages, 10 figures, software available to download at http://pyflation.ianhuston.net
arxiv created 2012/01/12 · openalex publication_date 2012/03/08 · arxiv updated 2012/03/09 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Isocurvature perturbations naturally occur in models of inflation consisting of more than one scalar field. In this paper, we calculate the spectrum of isocurvature perturbations generated at the end of inflation for three different inflationary models consisting of two canonical scalar fields. The amount of nonadiabatic pressure present at the end of inflation can have observational consequences through the generation of vorticity and subsequently the sourcing of B-mode polarization. We compare two different definitions of isocurvature perturbations and show how these quantities evolve in different ways during inflation. Our results are calculated using the open source Pyflation numerical package which is available to download.