Phys. Rev. D 76, 127501 (2007) [4 pages]Viability criterion for modified gravity with an extra forceReceived 21 July 2007; published 17 December 2007 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 notorious Dolgov-Kawasaki instability. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.76.127501
DOI:
10.1103/PhysRevD.76.127501
PACS:
04.50.+h, 04.20.Cv, 95.35.+d
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