VF o

This (conformally invariant) set of equations governs the propagation of electromagnetic waves (light) and it can also be regarded as the quantum-mechanical Schrodinger equation satisfied by individual free photons (see §3.4 and Appendix A2, A6).

In the case of gravity, the source [0]-tensor E (Einstein tensor, taking the place of J; see §2.6) does not have a scaling behaviour which provides conformal invariance for the equations, but there is a conformally invariant analogue of VF=0, which governs the propagation of gravitational waves, and provides an analogous Schrodinger equation for individual free gravitons. I shall write this symbolically (see Appendix A2, A5, A9) as

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