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  2. Rotating black hole - Wikipedia

    en.wikipedia.org/wiki/Rotating_black_hole

    A rotating black hole is a black hole that possesses angular momentum. In particular, it rotates about one of its axes of symmetry. All celestial objects – planets, stars , galaxies, black holes – spin. [1] [2] [3] The boundaries of a Kerr black hole relevant to astrophysics. Note that there are no physical "surfaces" as such.

  3. Kerr metric - Wikipedia

    en.wikipedia.org/wiki/Kerr_metric

    The Kerr metric or Kerr geometry describes the geometry of empty spacetime around a rotating uncharged axially symmetric black hole with a quasispherical event horizon.The Kerr metric is an exact solution of the Einstein field equations of general relativity; these equations are highly non-linear, which makes exact solutions very difficult to find.

  4. Hartle–Thorne metric - Wikipedia

    en.wikipedia.org/wiki/Hartle–Thorne_metric

    The Hartle–Thorne metric is an approximate solution of the vacuum Einstein field equations of general relativity [1] that describes the exterior of a slowly and rigidly rotating, stationary and axially symmetric body.

  5. A Scientist Says Time Travel Is Possible With Ring Lasers - AOL

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  6. Closed timelike curve - Wikipedia

    en.wikipedia.org/wiki/Closed_timelike_curve

    the interior of a rotating BTZ black hole; the van Stockum dust (which models a cylindrically symmetric configuration of dust) the Gödel lambda dust (which models a dust with a carefully chosen cosmological constant term) the Tipler cylinder (a cylindrically symmetric metric with CTCs) Bonnor-Steadman solutions describing laboratory situations ...

  7. Kerr–Newman metric - Wikipedia

    en.wikipedia.org/wiki/Kerr–Newman_metric

    The Kerr–Newman metric describes the spacetime geometry around a mass which is electrically charged and rotating. It is a vacuum solution which generalizes the Kerr metric (which describes an uncharged, rotating mass) by additionally taking into account the energy of an electromagnetic field, making it the most general asymptotically flat and stationary solution of the Einstein–Maxwell ...

  8. India launches first satellite to study black holes as ...

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  9. Outline of black holes - Wikipedia

    en.wikipedia.org/wiki/Outline_of_black_holes

    Ergosphere – region located outside a rotating black hole. Hawking radiation – black-body radiation that is predicted to be emitted by black holes, due to quantum effects near the event horizon. [2] Penrose process – process theorised by Roger Penrose wherein energy can be extracted from a rotating black hole.

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