Why does combining background independence and diffeomorphism invariance force you to conclude that spacetime must be quantized?

Physics Asked by oli bouchard on December 13, 2020

I was recently watching a fermilab video on loop quantum gravity and at about 4:20 it is stated that, when combined, background independence and diffeomorphism invariance force you to conclude that spacetime is quantized. Why?

discrete general relativity loop quantum gravity quantum gravity spacetime

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