arXiv:astro-ph/0703416AbstractReferencesReviewsResources
The Weak Energy Condition and the Expansion History of the Universe
Published 2007-03-15, updated 2007-11-30Version 2
We examine flat models containing a dark matter component and an arbitrary dark energy component, subject only to the constraint that the dark energy satisfies the weak energy condition. We determine the constraints that these conditions place on the evolution of the Hubble parameter with redshift, H(z), and on the scaling of the coordinate distance with redshift, r(z). Observational constraints on H(z) are used to derive an upper bound on the current matter density. We demonstrate how the weak energy condition constrains fitting functions for r(z).
Comments: 5 pages, 3 figures, references and discussion added
Journal: Phys.Lett.B659:457-461,2008
Keywords: expansion history, weak energy condition constrains, arbitrary dark energy component, energy condition constrains fitting functions, dark energy satisfies
Tags: journal article
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