Abstract
Abstract
We present the horizon structures and the shadows for Kerr-Newman-AdS black hole located in perfect fluid matter field in Rastall gravity. By considering the Hamilton-Jacobi equation and Carter constant separable method, we obtain the null geodesic equations of the black hole space-time as well as the unstable circular photon orbits in terms of the impact parameters. The horizon structures of the space-time are calculated numerically. The results show that there are four roots for a general case of the horizon equation (the Cauchy horizon
r
−
h
, the event horizon
r
+
h
, the cosmological horizon r
q
of Rastall gravity and the cosmological horizon r
c
of cosmological constant), which lead to a specific characteristic with the subregions of the space-time. The influences of the cosmological horizons r
q
and r
c
on the light trajectories around the black hole are also investigated. Furthermore, we study the effects of the parameters, including the perfect fluid matter intensity N
s
, the Rastall parameter k
λ, the cosmological constant Λ, the black hole spin a and the black hole charge Q on black hole shadows in detail.
Funder
JRT Science Data Center
National Natural Science Foundation of China
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