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"content": "nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpq0l88929ze7h5h7g7pu7y0e0077c03zqtp9zk63zpx4gg7m2ypcnqmcvgna wrote: \"Is it not a little strange that GR is so well-defined in the classical domain but virtually undefinable in the quantum domain?\"\n\n\"Virtually undefinable\" is an exaggeration: as I sketched out in my posts, there's a lot of work on quantum gravity, including quite reliable predictions of the first quantum corrections to the inverse square force law (below, where the term involving ℏ is this quantum correction and the other is a general relativity correction). \n\n\"What is the fundamental roadblock to quantisation?\"\n\nIf we knew that we'd be in great shape. \n\nI don't think anyone knows the \"fundamental\" roadblock, but one key problem is that all other quantum field theories are formulated on a spacetime with a fixed geometry described classically, called Minkowski spacetime. Gravity, on the other hand, is about how the geometry of spacetime is *not* fixed. And quantum gravity is probably about how we describe the geometry of spacetime in a quantum-mechanical way.\n\n@𝑑𝑜𝑢𝑔𝑚𝑒𝑟𝑟𝑖𝑡𝑡@𝑑𝑚𝑚\n\nhttps://media.mathstodon.xyz/media_attachments/files/113/767/447/305/644/050/original/8e6daf8007cfbdb4.jpg",
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