Scalar mode propagation in modified gravity with a scalar field

Details Scalar mode propagation in modified gravity with a scalar field Scalar mode propagation in modified gravity with a scalar field

2009-07-30

arxiv.org/abs/0907.5378v1

Phys.Rev.D80:083523,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

13 pages, 1 figure, uses RevTeX

Scientific paper

10.1103/PhysRevD.80.083523

We study the propagation of the scalar modes around a Friedmann-Lemaitre-Robertson-Walker universe for general modifications of gravity in the presence of a real scalar field. In general, there will be two propagating scalar perturbation fields, which will have in total four degrees of freedom. Two of these degrees will have a superluminal propagation--with k-dependent speed of propagation--whereas the other two will travel with the speed of light. Therefore, the scalar degrees of freedom do not modify the general feature of modified gravity models: the appearance of modes whose frequency depends on the second power of the modulus of the wave vector. Constraints are given and special cases are discussed.

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