Effect of electric interaction on the deflection and gravitational lensing in the strong field limit
arXiv:2203.05415 · doi:10.1140/epjc/s10052-023-12047-z
Abstract
The deflection angle of charged signals in general charged spacetime in the strong field limit is analyzed in this work using a perturbative method generalized from the neutral signal case. The solved naturally contains the finite distance effect and takes a quasi-power series form with a logarithmic divergence at the leading order. The coefficients of the series contain both the gravitational and electric contributions. Using the Reissner-Nordström spacetime as an example, we found that an electric repulsion (or attraction) tends to decrease (or increase) the critical impact parameter . If the repulsion is strong enough, then can shrink to zero and the critical particle sphere will disappear. These results are applied to the gravitational lensing of charge signal, from which we solved the image positions, their magnifications and time delays. It is found that in general, the electric repulsion (or attraction) will decrease (or increase) the image apparent angles, the black hole shadow size as well as their magnifications but increase (or decrease) the time delay.
arXiv comment15 pages, 8 figures; references added in v2
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