10,369 research outputs found
Gravitational Lensing by Asymptotically Flat 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 deflection'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.Comment: 9 pages, 14 figure
Effective theories and constraints on new phyhsics
Anomalous moments of the top quark arises from one loop corrections to the
vertices and . We study these anomalous couplings
in different frameworks: effective theories, Standard Model and 2HDM. We use
available experimental results in order to get bounds on these anomalous
couplings.Comment: 8 pages, 2 figures, talk presented by R. Martinez at the X Mexican
School of Particles and Fields, Playa del Carmen, Mexico, 200
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