Shadows of magnetically charged rotating black holes surrounded by quintessence *

Abstract

In this work, we study the optical properties of a class of magnetically charged rotating black hole spacetimes. The black holes in question are assumed to be immersed in the quintessence field, and subsequently, the resulting black hole shadows are expected to be modified by the presence of the dark energy. We investigate the photon region and the black hole shadow, and in particular, their dependence on the relevant physical conditions such as the state parameter of the quintessence, the angular momentum, and the magnitude of the magnetic charge. It is shown that the photon regions sensitively depend on the horizon structure and possess intricate features. Moreover, from the viewpoint of a static observer, we explore a few observables, especially those associated with the distortion of the observed black hole shadows.

Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A ∗

“…While particular emphasis has been placed on the possibility of quintessence surrounding BHs (see e.g. [1098][1099][1100][1101][1102][1103][1104][1105][1106][1107][1108][1109][1110][1111][1112][1113][1114][1115][1116][1117]), here we shall consider a much more strongly motivated scenario: that is, one where the BH is surrounded by DM. In fact, it is now an observationally established fact that DM is present in (almost) all galaxies, and is therefore expected to accumulate around SMBHs inhabiting galactic centers: therefore, it is worthwhile to consider how the surrounding DM back-reacts on the BH metric.…”

Deflection Angle and Shadow of the Reissner–Nordström Black Hole with Higher-Order Magnetic Correction in Einstein-Nonlinear-Maxwell Fields

“…The presence of magnetic charge tends to increase the curvature of the spacetime, resulting in more photons being pulled into the black hole and hence, decreasing the radius of the shadow [77]. Along with black hole spin, magnetic charge is found to create two distinct horizons, namely the inner and the outer horizons, defined by stable and unstable photon orbits [78]. For a negligible charge, they are one and indistinguishable.…”

Observational appearances of magnetically charged black holes in Born–Infeld electrodynamics

“…For invisible black holes, their silhouettes was also investigated [29]. The research on BH shadows has been expanded to many aspects in recent years [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47].…”