منابع مشابه
Hyperextended scalar-tensor gravity.
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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 ω = 0 BransDicke 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...
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Scalar fields with inverse power-law effective potentials may provide a negative pressure component to the energy density of the universe today, as required by cosmological observations. In order to be cosmologically relevant today, the scalar field should have a mass mφ = O(10 −33eV), thus potentially inducing sizable violations of the equivalence principle and space-time variations of the cou...
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ژورنال
عنوان ژورنال: Theoretical and Mathematical Physics
سال: 1997
ISSN: 0040-5779,1573-9333
DOI: 10.1007/bf02634517