Shadows of rotating Hayward-de Sitter black holes with astrometric observables

摘要: Motivated by recent work on rotating black hole shadow [Phys. Rev. D101, 084029 (2020)], we investigate the shadow behaviours of rotating Hayward-de Sitter black hole for static observers at a finite distance in terms of astronomical observables. This paper uses the newly introduced distortion parameter in [arXiv:2006.00685] to describe the shadow's shape quantitatively. We show that the spin parameter and the magnetic monopole charge would distort shadows. At the same time, the distortion could be relieved because of the cosmological constant. The distortion would increase with the distance from the black hole, and the greater the distance, the slower the increase. Besides, the spin parameter, magnetic monopole charge and cosmological constant increase will cause the shadow to shrink.