Relativistic stars in f(R) gravity, and absence thereof

Details Relativistic stars in f(R) gravity, and absence thereof Relativistic stars in f(R) gravity, and absence thereof

2008-07-16

arxiv.org/abs/0807.2503v2

Phys.Rev.D78:064019,2008

Astronomy and Astrophysics

Astrophysics

9 pages, 7 figures, v2: references added, minor corrections, version accepted for publication in PRD

Scientific paper

10.1103/PhysRevD.78.064019

Several f(R) modified gravity models have been proposed which realize the correct cosmological evolution and satisfy solar system and laboratory tests. Although nonrelativistic stellar configurations can be constructed, we argue that relativistic stars cannot be present in such f(R) theories. This problem appears due to the dynamics of the effective scalar degree of freedom in the strong gravity regime. Our claim thus raises doubts on the viability of f(R) models.

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