期刊
PHYSICS LETTERS B
卷 575, 期 1-2, 页码 1-3出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2003.09.033
关键词
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We point out that extended gravity theories, the Lagrangian of which is an arbitrary function of scalar curvature R, are equivalent to a class of the scalar-tensor theories of gravity. The corresponding gravity theory is omega = 0 Brans-Dicke gravity with a potential for the Brans-Dicke scalar field, which is not compatible with solar system experiments if the field is very light: the case when such modifications become important recently. (C) 2003 Elsevier B.V. All rights reserved.
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