The emergence of space-time
Consider gas in a box. A box full of some gaseous substance is made of atoms and molecules.
When we look at the gas in the box with our eyes, or our thermometers, we don’t see each individual atom or molecule, its position and velocity. We see coarse-grained features of the system. We can invent a predictive theory of what the gas is going to do based on the coarse-grained macroscopic observables. We can model things without knowing what every atom is doing. That’s emergence. You have a set of properties that are approximate and coarse-grained.
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Strange things happen when you try to combine Einstein’s description of curved space-time with a universe made up of quantum wavefunctions. This podcast shows how space and time are emergent properties of quantum reality but not fundamental parts of it.
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