Srednicki eqn. (2.23) and (2.24) states: We can make this a little fancier by defining the unitary spacetime translation operator(adsbygoogle = window.adsbygoogle || []).push({});

[tex] T(a) \equiv \exp(-iP^\mu a_\mu/ \hbar) [/tex]

Then we have

[tex] T(a)^{-1} \phi(x) T(a) = \phi(x-a) [/tex]

How do we get the second equation from the first equation?

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# Unitary spacetime translation operator

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