Restricting Fourth Order Gravity via Cosmology

Details Restricting Fourth Order Gravity via Cosmology Restricting Fourth Order Gravity via Cosmology

2010-12-15

arxiv.org/abs/1012.3353v2

Phys.Rev.D82:124044,2010

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

To appear in PRD

Scientific paper

10.1103/PhysRevD.82.124044

The cosmology of general fourth order corrections to Einstein gravity is considered, both for a homogeneous and isotropic background and for general tensor perturbations. It is explicitly shown how the standard cosmological history can be (approximately) reproduced and under what condition the evolution of the tensor modes remain (approximately) unchanged. Requiring that the deviations from General Relativity are small during inflation sharpens the current constraints on such corrections terms by some thirty orders of magnitude. Taking a more conservative approach and requiring only that cosmology be approximately that of GR during Big Bang Nucleosynthesis, the constraints are improved by 4 - 6 orders of magnitude.

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