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KG equation:

[itex] \square \Phi + m^{2} \Phi =0, ~~ m^{2} <0 \Rightarrow m=i \mu [/itex]

would lead to the form:

[itex] \square \Phi = \mu^{2} \Phi [/itex].

I'm trying to think if applying the same solution as in KG can also happen here...

Also for on-shell particles, I seem to be getting the "same" equation as we do for normal positive masses:

[itex] \int d^{4}k [k^{2}- \mu^{2}] \tilde{\Phi}(k) e^{ikx}=0 [/itex]

and so [itex] k^{2} = \mu^{2} [/itex]

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# Question about KG with negative mass^2

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