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Conformal transformations in classical gravitational theories and in cosmology
Valerio Faraoni, Edgard Gunzig, Pasquale Nardone
In recent years, the use of conformal transformation techniques has become widespread in the literature on gravitational theories alternative to general relativity, on cosmology, a…
When a mass term does not represent a mass
V. Faraoni, F. I. Cooperstock
The definition of mass of a scalar field in a curved space has often been generalized by grouping coupling terms between the field and the Ricci curvature with non-curvature-relate…
Does the non-minimal coupling of the scalar field improve or destroy inflation ?
Valerio Faraoni
The non-minimal coupling of a scalar field to the Ricci curvature in a curved spacetime is unavoidable according to several authors. The coupling constant is not a free parameter:…
The omega-tends-to-infinity limit of Brans-Dicke theory
Valerio Faraoni
The standard tenet that Brans-Dicke theory reduces to general relativity in the omega-tends-to-infinity limit has been shown to be false when the trace of the matter energy-momentu…
The influence of the cosmological expansion on local systems
F. I. Cooperstock, V. Faraoni, D. N. Vollick
Following renewed interest, the problem of whether the cosmological expansion affects the dynamics of local systems is reconsidered. The cosmological correction to the equations of…
Lensing by gravitational waves in scalar-tensor gravity: Einstein frame analysis
Valerio Faraoni, Edgard Gunzig
The amplification of a light beam due to intervening gravitational waves is studied. The previous Jordan frame result according to which the amplification is many orders of magnitu…