Optical properties of rotating Hayward-de Sitter black hole surrounded by quintessence.

In this paper, we discussed optical properties of the nonlinear magnetic charged black hole surrounded by quintessence with a nonzero cosmological constant Λ. Setting the state parameter ω = − 3 / 2 , we studied the horizons, the photon region and the shadow of this black hole. It turned out that for a fixed quintessential parameter γ , in a certain range, with the increase of the rotation parameter a and magnetic charge Q , the inner horizon radius increases while the outer horizon radius decreases. The cosmological horizon r Λ decreases when γ or Λ increases and it increases slightly when a and Q increase. The shapes of photon region were then studied and depicted through graphical illustrations. Finally, we discussed the effects of the quintessential parameter γ and the cosmological constant Λ on the shadow of this black hole with a fixed observer position in the domain of outer communication. [ABSTRACT FROM AUTHOR]