Changes

Many theories in physics have mathematical singularities of one kind or another.  Equations for these physical theories predict that the rate of change of some [[quantity]] becomes infinite or increases without limit. This is generally a sign for a missing piece in the theory.

Many theories in physics have mathematical singularities of one kind or another.  Equations for these physical theories predict that the rate of change of some [[quantity]] becomes infinite or increases without limit. This is generally a sign for a missing piece in the theory.

In [[supersymmetry]], a singularity in the [[moduli space]] happens usually when there are additional [[mass]]less degrees of freedom in that certain point. Similarly, it is thought that singularities in spacetime often mean that there are additional [[degrees of freedom]] that exist only within the vicinity of the singularity. The same, fields related to the whole spacetime also exist; for example, the [[electromagnetic field]]. In known examples of [[string theory]], the latter degrees of freedom are related to [[String theory|closed string]]s, while the degrees of freedom are "stuck" to the singularity and related either to open strings or to the twisted sector of an [[orbifold]].

In [[supersymmetry]], a singularity in the "moduli space" happens usually when there are additional [[mass]]less degrees of freedom in that certain point. Similarly, it is thought that singularities in spacetime often mean that there are additional degrees of freedom that exist only within the vicinity of the singularity. The same, fields related to the whole spacetime also exist; for example, the [[electromagnetic field]]. In known examples of [[string theory]], the latter degrees of freedom are related to closed strings, while the degrees of freedom are "stuck" to the singularity and related either to open strings or to the twisted sector of an "orbifold".

==Types==

==Types==