While the term refers to several situations, a null component of a field A is set to zero (or a simple function of other variables) in all cases.
[1][2] The advantage of light-cone gauge is that fields, e.g. gluons in the QCD case, are transverse.
Consequently, all ghosts and other unphysical degrees of freedom are eliminated.
where It is a method to get rid of the redundancies implied by Yang–Mills symmetry.
In string theory, light-cone gauge fixes the reparameterization invariance on the world sheet by where