How to check the unitarity of the theory by having field equation?

Asked Oct 02 '13 at 21:48

Active Oct 02 '13 at 21:55

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Let's have some field equation of some field corresponding to particles with mass $m$ and spin $s$. How to check the unitarity of the theory? May I do it without getting $S$-matrix? May the scalar product in a field space help?

edited Oct 02 '13 at 21:55

Qmechanic

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asked Oct 02 '13 at 21:48

How to check the unitarity of the theory by having field equation?

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