Live Blogging: Pitts

What is link between first-class constraints and gauge freedom? Team effort or individual? two answers in literature: Bergmann and Anderson argue for former. And that’s correct. G comes from constraints acting in concert. Latter is wrong says Pitts. Can see this by looking at the actual Poisson brackets to find out whether commuting with Hamiltonian entails making no physical change – i.e. generates a gauge transformation.

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