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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

Abstract

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
OAI identifier: oai:CiteSeerX.psu:10.1.1.316.7542
Provided by: CiteSeerX
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