Ibix
Science Advisor
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I'm sure you have written it down. But where did it enter your differential equations? What would be different about them if the LHS was not zero? Or to put it another way, if you had used ##\mathcal{L}'=\mathcal{L}\pm 1## instead?
I don't see why the substitution wouldn't work, as long as you understand that you've introduced a third angular coordinate that isn't an angle in spacetime in any meaningful sense. I just suspect that inserting you null/timelike/spacelike constraint will be messy.
I'd be very doubtful of anything passing through the origin, but that's an issue with the spacetime not the maths.
I don't see why the substitution wouldn't work, as long as you understand that you've introduced a third angular coordinate that isn't an angle in spacetime in any meaningful sense. I just suspect that inserting you null/timelike/spacelike constraint will be messy.
I'd be very doubtful of anything passing through the origin, but that's an issue with the spacetime not the maths.