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Irregular boundary of space-time in general relativity - region where space-time simply comes to an end. Often, such boundaries are associated with space-time curvature growing beyond all bounds and becoming infinitely large - so-called curvature singularities (notably Ricci singularities or Weyl singularities) - but there are exceptions (for instance a conic singularities).

According to general relativity, there exists a singularity inside every black hole, and the starting point of any universe described by a big bang model is a singularity, as well. The occurence of sinularities is a failure of general relativity - and a strong indication that the theory is incomplete. Instead, one such describe the earliest universe and the interior of black holes using a theory of quantum gravity.

More information about singularities can be found in the spotlight texts Spacetime singularities and Of singularities and breadmaking.


  • space-time singularity