Physics Lournal

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Every theory is assigned a point in theory space, and and the connection between them through resolutions is called the flow of the theories.

In theory space, Naturalness means a low level theory shouldn't sensitively depend on a high level theory.

We should be able to start at any high level theory, and work our way down to the standard model, but if we have to pick a certain theory at high resolution in order to get to the standard model, then we have to fine tune the start.