The nearly Newtonian regime in Non-Linear Theories of Gravity

Details The nearly Newtonian regime in Non-Linear Theories of Gravity The nearly Newtonian regime in Non-Linear Theories of Gravity

2005-07-07

arxiv.org/abs/gr-qc/0507027v3

Gen.Rel.Grav.38:1407-1417,2006

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

typos corrected, replaced to match published version

Scientific paper

10.1007/s10714-006-0328-8

The present paper reconsiders the Newtonian limit of models of modified gravity including higher order terms in the scalar curvature in the gravitational action. This was studied using the Palatini variational principle in [Meng X. and Wang P.: Gen. Rel. Grav. {\bf 36}, 1947 (2004)] and [Dom\'inguez A. E. and Barraco D. E.: Phys. Rev. D {\bf 70}, 043505 (2004)] with contradicting results. Here a different approach is used, and problems in the previous attempts are pointed out. It is shown that models with negative powers of the scalar curvature, like the ones used to explain the present accelerated expansion, as well as their generalization which include positive powers, can give the correct Newtonian limit, as long as the coefficients of these powers are reasonably small. Some consequences of the performed analysis seem to raise doubts for the way the Newtonian limit was derived in the purely metric approach of fourth order gravity [Dick R.: Gen. Rel. Grav. {\bf 36}, 217 (2004)]. Finally, we comment on a recent paper [Olmo G. J.: Phys. Rev. D {\bf 72}, 083505 (2005)] in which the problem of the Newtonian limit of both the purely metric and the Palatini formalism is discussed, using the equivalent Brans--Dicke theory, and with which our results partly disagree.

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