String Theory
In string theory, light-cone gauge fixes the reparameterization invariance on the world sheet by
where is a constant and is the worldsheet time.
The advantage of light-cone gauge is that all ghosts and other unphysical degrees of freedom can be eliminated. The disadvantage is that some symmetries such as Lorentz symmetry become obscured (they become non-manifest, i.e. hard to prove).
Read more about this topic: Light Cone Gauge
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