Degeneracy in exotic gravitational lensing

Details Degeneracy in exotic gravitational lensing Degeneracy in exotic gravitational lensing

2002-08-14

arxiv.org/abs/gr-qc/0208039v1

Mod.Phys.Lett. A17 (2002) 1685-1692

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Accepted for publication in Modern Physics Letters A

Scientific paper

10.1142/S0217732302008083

We present three different theoretically foreseen, but unusual, astrophysical situations where the gravitational lens equation ends up being the same, thus producing a degeneracy problem. These situations are (a) the case of gravitational lensing by exotic stresses (matter violating the weak energy condition and thus having a negative mass, particular cases of wormholes solutions can be used as an example), (b) scalar field gravitational lensing (i.e. when considering the appearance of a scalar charge in the lensing scenario), and (c) gravitational lensing in closed universes (with antipodes).The reasons that lead to this degeneracy in the lens equations, the possibility of actually encountering it in the real universe, and eventually the ways to break it, are discussed.

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