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Reference.org
Kerr metric
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<p>The Kerr metric or Kerr geometry describes the geometry of empty <a href="/facts/Spacetime/uRIN1x4b">spacetime</a> around a rotating uncharged <a href="/facts/Axially_symmetric/gEgSEFxy">axially symmetric</a> <a href="/facts/Black_hole/1r2lmkcF">black hole</a> with a quasispherical <a href="/facts/Event_horizon/KXH2ptnI">event horizon</a>. The Kerr <a href="/facts/Metric_tensor/tbqek1gJ">metric</a> is an <a href="/facts/Exact_solutions_in_general_relativity/MFb3MFaC">exact solution</a> of the <a href="/facts/Einstein_field_equations/j2rJTzW9">Einstein field equations</a> of <a href="/facts/General_relativity/jVsoIg8X">general relativity</a>; these equations are highly <a href="/facts/Nonlinear_system/4aYItALC">non-linear</a>, which makes exact solutions very difficult to find. </p>