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Gravitational Lensing by Wormholes

Natural wormholes and its astrophysical signatures have been sugested in various oportunities. By applying the strong ﬁeld limit of gravitational lensing theory, we calculate the deﬂection angle and magniﬁcation curves produced by Morris-Thorne wormholes in asimptotically ﬂat space-times. The results show that wormholes act like convergent lenses. Therefore, we show that it is hard to distinguish them from black holes using the de-ﬂection’s angle of the gravitational lens eﬀect, in contrast with the results reported by Cramer et.al. and Safanova et.al. However, we also show that it is possible, in principle, distinguish them by the magniﬁcation curves, in particular, by observing the position of the peak of the Einstein’s ring.