(* r,θ,φ: A=0, x,y,z: A=a *)
 rE = M + Sqrt[M^2 - a^2 Cos[θ]^2]; {Sqrt[rE^2 + A^2] Sin[θ], rE Cos[θ]};      (* Ergosphäre *)
 rA = M + Sqrt[M^2 - a^2]; {Sqrt[rA^2 + A^2] Sin[θ], rA Cos[θ]}; (* äußerer Ereignishorizont *)
 rI = M - Sqrt[M^2 - a^2]; {Sqrt[rI^2 + A^2] Sin[θ], rI Cos[θ]}; (* innerer Ereignishorizont *)

Code: Mathematica Syntax

References: Kerr-Schild Plot^[1], Boyer-Lindquist Plot ^[2]

DescriptionErgosphere and event horizons of a rotating black hole.gif	English: Diagram of the static limit (ergosphere) and the inner and outer event horizons of a rotating black hole. "a" is the Spin parameter of the rotating black hole; with a low spin-parameter the ergosphere converges to an ellipsoid, while with a high spin-parameter it resembles a pumpkin-shape. The axes are in units of GM/c². If a=0 both coordinate systems reduce to Schwarzschild.
Date	27 July 2016
Source	Own work
Author	Yukterez (Simon Tyran, Vienna)
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1. ↑ Matt Visser: The Kerr Spacetime, page 35, Fig. 3
2. ↑ Edwin Taylor: The Spinning Black Hole, page 8, Fig. 3

• en.wikipedia.org/wiki/Black hole
• en.wikipedia.org/wiki/Rotating black hole
• en.wikipedia.org/wiki/Ergosphere
• en.wikipedia.org/wiki/Frame-dragging
• https://ru.wikipedia.org/wiki/Вращающаяся чёрная дыра
• https://vi.wikipedia.org/wiki/Lỗ đen
• de.wikipedia.org/wiki/Schwarzes Loch
• de.wikipedia.org/wiki/Aktiver_Galaxienkern
• de.wikipedia.org/wiki/Blandford-Znajek-Prozess