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astro-ph1992
On the rotation of polarization by a gravitational lens
Valerio Faraoni
It is proved that the field of a gravitational lens induces no rotation in the polarization vector of electromagnetic radiation, in agreement with the previous literature, but with…
astro-ph1992★ 30 cited
On the Tail Problem in Cosmology
Valerio Faraoni, Sebastiano Sonego
The tail problem for the propagation of a scalar field is considered in a cosmological background, taking a Robertson-Walker spacetime as a specific example. The explicit radial de…
astro-ph1992★ 20 cited
Nonstationary Gravitational Lenses and the Fermat Principle
Valerio Faraoni
We apply Perlick's (1990a) rigorous formulation of the Fermat principle in arbitrary spacetimes to prove the correctness of the description of gravitational lensing by gravitationa…