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Cosmic Growth History and Expansion History

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arxiv astro-ph/0507263 v2 pith:EDR2ZAC3 submitted 2005-07-11 astro-ph gr-qc

classification astro-phgr-qc
keywords growthhistorycosmicexpansionenergydensityevolutiongravitational
verification ladder T0 review T1 audit T2 compute T3 formal
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The cosmic expansion history tests the dynamics of the global evolution of the universe and its energy density contents, while the cosmic growth history tests the evolution of the inhomogeneous part of the energy density. Precision comparison of the two histories can distinguish the nature of the physics responsible for the accelerating cosmic expansion: an additional smooth component - dark energy - or a modification of the gravitational field equations. With the aid of a new fitting formula for linear perturbation growth accurate to 0.05-0.2%, we separate out the growth dependence on the expansion history and introduce a new growth index parameter \gamma that quantifies the gravitational modification.

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Forward citations

Cited by 14 Pith papers

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