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Klein-Gordon Hamiltonian commutator
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[QUOTE="DEvens, post: 5224256, member: 475460"] Start by looking at your problem statement. It sure looks like you have it typed in incorrectly, since there is no equals sign in it. What is it you are meant to be showing? The text ends with the word "then" so one would expect to have to show something equals something else. Heh. It's funny that the forum's spell checker does not know the word commutator. It keeps trying to change it to commenter. So you have the commutator of phi with pi. And you have the Hamiltonian in terms of phi and pi. So you should be able to work out [H,F]. You just remember your rules for integrals and "integration by parts" and things of that nature. And then the only difficult part is relating that commutator to the time derivative you have. Assuming there is an equals sign in there some place. For that you are going to need just a little bit more information. For example, what is [H,phi]? And what is [H,pi]? Or, to put it another way, how can you get the time derivative of phi and pi? [/QUOTE]
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Klein-Gordon Hamiltonian commutator
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