Crossing the phantom divide with parametrized post-Friedmann dark energy

2008/08/31 by Wenjuan Fang, Wayne Hu, Antony Lewis · 4 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Solar and Space Plasma Dynamics #astro-ph

paper · pdf · doi:10.1103/physrevd.78.087303

published as Phys.Rev.D78:087303,2008 · 4 pages, 2 figures, code available at http://camb.info/ppf, minor revisions reflect PRD published version

openalex publication_date 2008/10/24 · arxiv created 2008/11/30 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

Dark energy models with a single scalar field cannot cross the equation of state divide set by a cosmological constant. More general models that allow crossing require additional degrees of freedom to ensure gravitational stability. We show that a parameterized post-Friedmann description of cosmic accelerzation provides a simple but accurate description of multiple scalar field crossing models. Moreover the prescription provides a well-controlled approximation for a wide range of ``smooth'' dark energy models. It conserves energy and momentum and is exact in the metric evolution on scales well above and below the transition scale to relative smoothness. Standard linear perturbation tools have been altered to include this description and made publicly available for studies of the dark energy involving cosmological structure out to the horizon scale.

Citations

• On the Growth of Perturbations as a Test of Dark Energy and Gravity

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