Friedmann Equation and Stability of Inflationary Higher Derivative Gravity

Details Friedmann Equation and Stability of Inflationary Higher Derivative Gravity Friedmann Equation and Stability of Inflationary Higher Derivative Gravity

1999-11-29

arxiv.org/abs/gr-qc/9911116v4

Phys.Rev. D63 (2001) 127301

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Revtex, 6 pages, Add two more references, some typos corrected

Scientific paper

10.1103/PhysRevD.63.127301

Stability analysis on the De Sitter universe in pure gravity theory is known to be useful in many aspects. We first show how to complete the proof of an earlier argument based on a redundant field equation. It is shown further that the stability condition applies to $k \ne 0$ Friedmann-Robertson-Walker spaces based on the non-redundant Friedmann equation derived from a simple effective Lagrangian. We show how to derive this expression for the Friedmann equation of pure gravity theory. This expression is also generalized to include scalar field interactions.

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