Comments on Scalar-Tensor Representation of $f(R)$ Theories

Details Comments on Scalar-Tensor Representation of $f(R)$ Theories Comments on Scalar-Tensor Representation of $f(R)$ Theories

2008-08-15

arxiv.org/abs/0808.2133v2

Phys.Scripta 80:045902,2009

Astronomy and Astrophysics

Astrophysics

7 pages, no figures, To appear in Physica Scripta

Scientific paper

10.1088/0031-8949/80/04/045902

We propose a scalar-tensor representation of $f(R)$ theories with use of conformal transformations. In this representation, the model takes the form of the Brans-Dicke model with a potential function and a non-zero kinetic term for the scalar field. We show that due to interaction of the scalar field with matter systems, the corresponding matter stress tensor is not conserved and test particles experience an anomalous acceleration.

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