Einstein attempted to unify gravity with quantum physics and black hole singularities using frameworks that were continuous.

He never attempted any discrete frameworks, but the modern world has become obsessed with discrete frameworks like LQG and string theory. Quantum physics itself is discrete, hence the word quanta — meaning discrete quantities.

It’s hard to think spacetime is continuous if quantum physics is discrete, but Einstein kept believing a way would emerge that maintained space-time as a continuum.
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