Crossing the phantom divide with parametrized post-Friedmann dark energy

Fang, Wenjuan, Hu, Wayne and Lewis, Antony (2008) Crossing the phantom divide with parametrized post-Friedmann dark energy. Physical Review D, 78 (8). 087303. ISSN 1550-7998

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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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: Antony Lewis
Date Deposited: 06 Feb 2012 21:25
Last Modified: 12 Mar 2017 03:53
URI: http://sro.sussex.ac.uk/id/eprint/31178

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