Shadows of Kerr-like black holes in a modified gravity theory

High-dimensional Schwarzschild black holes in scalar-tensor-vector gravity theory

“…5, where the spacetime dimension is taken to be D = 5, 6, 7, respectively, and the case of D = 4 is attached. We find that the increase of the parameter α makes the shadow radius increase, while the increase of the spacetime dimension makes the shadow radius decrease, which is consistent with the relevant conclusions in the four-dimensional Schwarzschild STVG black hole [31,32] and the high-dimensional Schwarzschild-Tangherlini black hole [42]. We notice the significant difference between the shadow radius R sh of the four-dimensional Schwarzschild STVG black hole and that of the high-dimensional ones (D = 5, 6, 7) in Fig.…”

“…It should be noted that the parameter α = 0 represents the case of the Schwarzschild-Tangherlini black hole of Einstein's gravity. On the one hand, we can see that when D is a given high-dimensional spacetime dimension from five to seven, the peak of the energy emission rate decreases as the parameter α increases in the high-dimensional Schwarzschild STVG black hole, which is similar to the situation in the four-dimensional Schwarzschild STVG black hole [31]. On the other hand, we can clearly see that the peak of the energy emission rate increases rapidly with the increase of the spacetime dimension for a fixed α, which is similar to situation in the Schwarzschild-Tangherlini black hole [37].…”

“…6, where the case of D = 4, see Refs. [31,40], is attached for comparison. It should be noted that the parameter α = 0 represents the case of the Schwarzschild-Tangherlini black hole of Einstein's gravity.…”

“…The STVG theory not only describes [21,22,23,24] the dynamics of galaxies without the assumption of existence of dark matter in the universe, but also explains [25,26] the solar system, the growth of structure, the cosmic microwave background (CMB) acoustical power spectrum data, and so on. Recently, the quasinormal modes of electromagnetic and gravitational perturbations and black hole shadows in the STVG theory have been made progress [27,28,29,30,31,32,33].…”

Constraining rotating black hole via curvature radius with observations of M87*

“…Aiming on these purposes, many works have been done, see Refs. [2][3][4][5][6][7][8][9][10][11] for examples. In particular, with future observations, like the Next Generation Very Large Array [12], the Thirty Meter Telescope [13], and the BlackHoleCam [14], we will have good opportunity to peek into the strong gravity regime.…”