Live Blogging: Knox

We tend to have the view that spacetime and dynamical symmetries should match. (e.g. Earman).  But in GR it is not quite clear to say how this should go.

The roles we care about will be filled by an object if it provides (locally) preferred inertial co-ords. (Brown, more or less).

Thus we can interrogate a theory to see if it has such an object.

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