Acceleration from Modified Gravity: Lessons from Worked Examples

Details Acceleration from Modified Gravity: Lessons from Worked Examples Acceleration from Modified Gravity: Lessons from Worked Examples

2009-06-10

arxiv.org/abs/0906.2024v1

Nucl.Phys.Proc.Suppl.194:230-238,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages, 1 figure, Nuclear Physics B, GGI Proceedings

Scientific paper

10.1016/j.nuclphysbps.2009.07.08

I examine how two specific examples of modified gravity explanations of cosmic acceleration help us understand some general problems confronting cosmological tests of gravity: how do we distinguish modified gravity from dark energy if they can be made formally equivalent? how do we parameterize deviations according to physical principles with sufficient generality, yet focus cosmological tests into areas that complement our existing knowledge of gravity? how do we treat the dynamics of modifications which necessarily involve non-linearities that preclude superposition of forces? The modified action f(R) and DGP braneworld models provide insight on these question as fully-worked examples whose expansion history, linear perturbation theory, and most recently, non-linear N-body and force-modification field dynamics of cosmological simulations are available for study.

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