Can anyone explain why vacuum energy must be zero if we are to use LSZ formalism?

  • $\begingroup$ Energy? Are you sure you don't mean $P^\mu \lvert \Omega \rangle = 0$ ? $\endgroup$ – John Rennie Dec 15 '18 at 12:08
  • $\begingroup$ Isn't $P^u$ energy-momentum? $\endgroup$ – Mark Vanderbilt Dec 15 '18 at 12:36

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