The state annihilated by every annihilation operator of the positive-frequency mode basis chosen in the asymptotic past. A Bogoliubov transformation can make it contain particles when tested by future out-mode number operators.

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  1. In-vacuum and out-vacuum
  2. Bogoliubov transformation
  3. Vacuum ambiguity in a nonstationary spacetime
  4. Quantum field theory in curved spacetime
  5. Quantum field theory
  6. Branch of physics
  7. Physics
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