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Einstein’s gravitational lensing and nonlinear electrodynamics

By Herman J. Mosquera Cuesta, José A. De Freitas Pacheco and José M. Salim


Einstein (1936) predicted the phenomenon presently known as gravitational lensing (GL). A prime feature of GL is the magnification, because of the gravitational field, of the star visible surface as seen from a distant observer. We show here that nonlinear electrodynamics (NLED) modifies in a fundamental basis Einstein’s general relativistic (GR) original derivation. The effect becomes apparent by studying the light propagation from a strongly magnetic (B) pulsar (SMP). Unlike its GR counterpart, the photon dynamics in NLED leads to a new effective GL, which depends also on the B-field permeating the pulsar. The apparent radius of a SMP appears then unexpectedly diminished, by a large factor, as compared to the classical Einstein’s prediction. This may prove very crucial in determining physical properties of high B-field stars from their X-ray emission. Received(07/04/2004) – Revised(16/05/2005

Topics: Gravitational lensing — Relativity — stars, neutron — stars, magnetic fields — nonlinear electrodynamics
Year: 2005
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