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Viability criterion for modified gravity with an extra force

Journal

PHYSICAL REVIEW D
Volume 76, Issue 12, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.76.127501

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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.

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