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(Some uses.) 
(NewmanPenrose) 

A boost in the tx plane shows up as <math>x^+ \to e^\beta x^+</math>, <math>x^ \to e^{\beta}x^</math>, <math>x^i \to x^i</math>. A rotation in the ijplane only affects <math>x_\perp</math>. The parabolic transformations show up as <math>x^+ \to x^+</math>, <math>x^ \to x^ + \delta_{ij}\alpha^i x^j + \frac{\alpha^2}{2} x^+</math>, <math>x^i \to x^i + \alpha^i x^+</math>. Another set of parabolic transformations show up as <math>x^+ \to x^+ + \delta_{ij}\alpha^i x^j + \frac{\alpha^2}{2} x^</math>, <math>x^ \to x^</math> and <math>x^i \to x^i + \alpha^i x^</math>.
Light cone coordinates can also be generalized to curved spacetime in general relativity. Sometimes, calculations simplify using light cone coordinates. See [[NewmanPenrose formalism]].
Light cone coordinates are sometimes used to describe relativistic collisions, especially if the relative velocity is very close to the speed of light. It's also used in the [[light cone gauge]] of string theory.
== See also ==
* [[NewmanPenrose formalism]]
{{relativitystub}}

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