If electrons actually 'orbited' a nucleus, then no atoms could ever form The electron would radiate away all its energy and fall into the nucleus in about 10 𝑡𝑟𝑖𝑙𝑙𝑖𝑜𝑛𝑡𝘩𝑠 of a secondpic.twitter.com/5JvjrhpAGl
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but gravity is a property of space, it doesn't radiate away, the electron could be riding on a similar curvature of space
yes, but the curvature of space is related to the energy density of spacetime (via the Einstein field equations) and the energy density can still be more or less in a given region
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From GR, the energy density is just the cosmological constant, you don't have a quantum gravity theory
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you're thinking of the vacuum energy density .. the energy density due to matter is the stress-energy tensor
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