which would give a set of constraints amongst the coefficients ψ ψ ( x , y , . . . ) . This means the amplitudes for N gravitons at certain positions is related to the amplitudes for a different number of gravitons at different positions. Or, one could use the two-field formalism, treating ω ω ( g ) as an independent field so that the wave function is Ψ Ψ [ γ γ , ω ω ] .