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Singularities in General Relativity coupled to nonlinear electrodynamics

We study here some consequences of the nonlinearities of the electromagnetic field acting as a source of Einstein’s equations on the propagation of photons. We restrict to the particular case of a “regular black hole”, and show that there exist singularities in the effective geometry. These singularities may be hidden behind a horizon or naked, according to the value of a parameter. Some unusual properties of this solution are also analyzed.

M. Novello, S. E. Perez Bergliaffa, and J. M. Salim

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