Question: Does Epsilon = i A^+/p^+ for Zwiebach Page 178?

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Homework Statement


Below equation 10.77, Zwiebach claims that the gauge epsilon = i A^+/p^+ makes the vector potential component A^+ vanish.

However, I thought epsilon was supposed to be infinitesimal and a constant, both of which are violated by setting epsilon equal to the expression?


Homework Equations





The Attempt at a Solution

 

Discussion

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I thought epsilon was supposed to be infinitesimal and a constant, both of which are violated by setting epsilon equal to the expression?
Actually, just above equation (10.68) on page 177, he refers you back to Section 3.3 where on page 43, just below equation (3.19) he writes that epsilon is an arbitrary function of the coordinates.