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Strong field limit analysis of gravitational retro-lensing
Ernesto F. Eiroa, Diego F. Torres
We present a complete treatment in the strong field limit of gravitational retro-lensing by a static spherically symmetric compact object having a photon sphere. The results are co…
Degeneracy in exotic gravitational lensing
Margarita Safonova, Diego F. Torres
We present three different theoretically foreseen, but unusual, astrophysical situations where the gravitational lens equation ends up being the same, thus producing a degeneracy p…
Reissner-Nordstrom black hole lensing
Ernesto F. Eiroa, Gustavo E. Romero, Diego F. Torres
In this paper we study the strong gravitational lensing scenario where the lens is a Reissner-Nordstrom black hole. We obtain the basic equations and show that, as in the case of S…
On the possibility of an astronomical detection of chromaticity effects in microlensing by wormhole-like objects
Diego F. Torres, Ernesto F. Eiroa, Gustavo E. Romero
We study the colour changes induced by blending in a wormhole-like microlensing scenario with extended sources. The results are compared with those obtained for limb darkening. We…
Self-existing objects and auto-generated information in chronology-violating space-times: A philosophical discussion
Gustavo E. Romero, Diego F. Torres
Closed time-like curves naturally appear in a variety of chronology-violating space-times. In these space-times, the Principle of Self-Consistency demands an harmony between local…
Microlensing by natural wormholes: theory and simulations
Margarita Safonova, Diego F. Torres, Gustavo E. Romero
We provide an in depth study of the theoretical peculiarities that arise in effective negative mass lensing, both for the case of a point mass lens and source, and for extended sou…