Lightcone gauge is ##X^u=\tau=1/\sqrt{2}(X^0+X^{D-1})## (1)(adsbygoogle = window.adsbygoogle || []).push({});

The mode expansions are:

My book says 'it is possible to solve for one of the oscillators in terms of all the others' with this relation.

What is a oscillator? Is this any of the ##X^{D}## coordinates, what exactly does ##n## represent, 'frequencies' of a given oscillator?

Does the notation ## X^{D-1}## refer to any spatial coordinate that is the preferred choice?

So basically the relation (1) reduces the number of equations to solve by one, is this what this statement means?

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# A Quick question, string theory introduction, lightcone gauge

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