#### samalkhaiat

Science Advisor

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Yes and it is very trivial. I have already told you that shifting the energy by a constant does not change any thing. So, if you have the eignvalue equations [itex]\left( M_{\mu\nu}, P_{\mu}\right)|\Omega \rangle = (c_{\mu\nu},q_{\mu})| \Omega \rangle[/itex], you can always redefine the Poincare’ generators [itex]\left( M_{\mu\nu},P_{\mu}\right) \to \left( M_{\mu\nu}+ c_{\mu\nu},P_{\mu}+q_{\mu}\right)[/itex] to obtain [itex]\left( M_{\mu\nu},P_{\mu}\right)| \Omega \rangle = 0[/itex].Do I miss something?