Generalized Gravity and a Ghost

Details Generalized Gravity and a Ghost Generalized Gravity and a Ghost

2005-02-15

arxiv.org/abs/gr-qc/0502070v2

JCAP 0503 (2005) 008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

8 pages, a reference added

Scientific paper

10.1088/1475-7516/2005/03/008

We show that generalized gravity theories involving the curvature invariants of the Ricci tensor and the Riemann tensor as well as the Ricci scalar are equivalent to multi- scalar-tensor gravities with four derivatives terms. By expanding the action around a vacuum spacetime, the action is reduced to that of the Einstein gravity with four derivative terms, and consequently there appears a massive spin-2 ghost in such generalized gravity theories in addition to a massive spin-0 field.

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