Light deflection by squashed Kaluza-Klein black holes in a plasma medium

Abstract

We study motions of photons in an unmagnetized cold homogeneous plasma medium in the five-dimensional charged static squashed Kaluza-Klein black hole spacetime. In this case, a photon behaves as a massive particle in a four-dimensional spherically symmetric spacetime. We consider the light deflection by the squashed Kaluza-Klein black hole surrounded by the plasma in a weakfield limit. We derive corrections of the deflection angle to general relativity, which are related to the size of the extra dimension, the charge of the black hole and the ratio between the plasma and the photon frequencies.

Superentropic black hole shadows in arbitrary dimensions

“…Precisely, it has been revealed that such a transition generates certain universalities [7,8]. Moreover, the optical aspect has been approached by investigating the deflection angle of the light rays and the shadow behaviors [9][10][11][12][13][14][15][16][17][18][19][20][21]. In four dimensions, the black hole shadows of various black holes have been engineered using one dimensional real curves [22][23][24][25].…”

Superentropic Black Hole Shadows in Arbitrary Dimensions

“…Precisely, it has been revealed that such a transition generates certain universalities [7,8]. Moreover, the optical aspect has been approached by investigating the deflection angle of light rays and the shadow behaviors [9][10][11][12][13]. In four dimensions, the black hole shadows of various black holes have been engineered using one dimensional real curves [14][15][16][17].…”

Deflection of light rays by spherically symmetric black hole in dispersive medium

“…In a recent paper [30], we have investigated gravitational microlensing in the presence of plasma ('hill-hole' effect). For some other recent studies see [31][32][33][34][35][36][37][38]. Recent review of plasma effects in gravitational lensing can be found in [39].…”