A viability criterion for modified gravity with an extra force

Details A viability criterion for modified gravity with an extra force A viability criterion for modified gravity with an extra force

2007-10-05

arxiv.org/abs/0710.1291v1

Phys.Rev.D76:127501,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 latex pages, to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.76.127501

A recently proposed theory of modified gravity with an explicit ``anomalous''
coupling of the Ricci curvature to matter is discussed, and an inequality is
derived which expresses a necessary and sufficient condition to avoid the
notorius Dolgov-Kawasaki instability.

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