Cosmic Growth History and Expansion History

Details Cosmic Growth History and Expansion History Cosmic Growth History and Expansion History

2005-07-11

arxiv.org/abs/astro-ph/0507263v2

Phys.Rev.D72:043529,2005

Astronomy and Astrophysics

Astrophysics

8 pages, 3 figures; minor changes to match version accepted to PRD

Scientific paper

10.1103/PhysRevD.72.043529

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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