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In chapter 8 Srednicki employs the [tex] 1-i \epsilon [/tex] trick. He multiplies the Hamiltonian desity,

[tex] H=\frac{1}{2} \Pi^2+\frac{1}{2}(\nabla\phi)^2+\frac{1}{2}m^2\phi^2 [/tex]

by this [tex] 1-i \epsilon [/tex], and says it's equivalent to if we replaced m^2 with [tex] m^2-i \epsilon [/tex]. I cant see how this is?

Thanks

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# Srednicki QFT chapter 8 question

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