Oddbean new post about login | logout Loop quantum gravity breaks one of Einstein’s most important rules: the spacetime fabric must be continuous. Loop quantum gravity is discrete, but quantum physics itself is discrete too — hence its incompatibility with spacetime. We’ll see if Einstein was right about the continous nature of spacetime, or if discrete theories like LQG win out… but I’m betting on Einstein. 😎🍻
This video goes through the history of geometries and was quite inspiring: nostr:note1xe83z7pva44agvzp6xsaqn5tawc0g40pg49m7mukxg2kdz5v4u8stv46cd
Well Einstein is right in the same way that newton was right. It was a more accurate description of gravity. It’s not the most accurate, which is why need a revision of it over smaller scales. I found this episode enlightening https://podcasts.apple.com/ca/podcast/theories-of-everything-with-curt-jaimungal/id1521758802?i=1000673194968
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. nostr:note154fefj37u9z0u2v0s7g8j6d8ccpsewhc7mfcefl6q53kq32j3vzqag82j9