Gravitational lensing due to dark matter modelled by vector field
Abstract
The specified constant 4-vector field reproducing the spherically symmetric stationary metric of cold dark matter halo in the region of flat rotation curves results in a constant angle of light deflection at small impact distances. The effective deflecting mass is factor π/2 greater than the dark matter mass. The perturbation of deflection picture due to the halo edge is evaluated.
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