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The creation of multiple images by a gravitational wave
Valerio Faraoni
We describe gravitational lensing by a gravitational wave, in the regime in which multiple images of a light source are created. We adapt the vector formalism employed for ordinary…
The redshift periodicity of galaxies as a probe of the correctness of general relativity
Valerio Faraoni
Recent theoretical work determines the correct coupling constant of a scalar field to the Ricci curvature of spacetime in general relativity. The periodicity in the redshift distri…
Effects of the gravivector and graviscalar fields in N=2,8 supergravity
S. Bellucci, V. Faraoni
The available tests of the equivalence principle constrain the mass of the Higgs-like boson appearing in extended supergravity theories. We determine the constraints imposed by hig…
Light amplification by gravitational waves in scalar-tensor theories of gravity
Valerio Faraoni
It is shown that the amplification of a light beam by gravitational waves in scalar-tensor theories of gravity is a first order effect in the wave amplitudes. In general relativity…
Non-minimal coupling of the scalar field and inflation
Valerio Faraoni
We study the prescriptions for the coupling constant of a scalar field to the Ricci curvature of spacetime in specific gravity and scalar field theories. The results are applied to…