The shadow and observation appearance of black hole surrounded by the dust field in Rastall theory
Xuan-Ran Zhu(朱轩然)1,†, Yun-Xian Chen(陈芸仙)2,‡, Ping-Hui Mou(牟平辉)2,§, and Ke-Jian He(何柯腱)3,¶
1 Chongqing College of Mobile Communication, Chongqing 401520, China; 2 Physics and Space College, China West Normal University, Nanchong 637000, China; 3 Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics, Chongqing University, Chongqing 401331, China
Abstract In the context of Rastall gravity, the shadow and observation intensity casted by the new Kiselev-like black hole with dust field have been numerically investigated. In this system, the Rastall parameter and surrounding dust field structure parameter have considerable consequences on the geometric structure of spacetime. Considering the photon trajectories near the black hole, we investigate the variation of the radii of photon sphere, event horizon and black hole shadow under the different related parameters. Furthermore, taking into account two different spherically symmetric accretion models as the only background light source, we also studied the observed luminosity and intensity of black holes. For the both spherical accretions background, the results show that the decrease or increase of the observed luminosity depends on the value range of relevant parameters, and the promotion effect is far less obvious than the attenuation effect on the observed intensity. One can find that the inner shadow region and outer bright region of the black hole wrapped by infalling accretion are significantly darker than those of the static model, which is closely related to the Doppler effect. In addition, the size of the shadow and the position of the photon sphere are always the same in the two accretion models, which means that the black hole shadow depend only on the geometry of spacetime, while the observation luminosity is affected by the form of accretion material and the related spacetime structure.
(Einstein-Maxwell spacetimes, spacetimes with fluids, radiation or classical fields)
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11875095 and 11903025) and Basic Research Project of Science and Technology Committee of Chongqing (Grant No. cstc2018jcyjA2480).
Xuan-Ran Zhu(朱轩然), Yun-Xian Chen(陈芸仙), Ping-Hui Mou(牟平辉), and Ke-Jian He(何柯腱) The shadow and observation appearance of black hole surrounded by the dust field in Rastall theory 2023 Chin. Phys. B 32 010401
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