A one-parameter family of flat-spacetime vacua, built from Minkowski plane waves with exponential weights, is shown to be a continuous-mode squeezed vacuum with tanh r(ν) = e^(−πν/κ), reducing to the Minkowski vacuum as κ→0.
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Kappa Plane Wave Modes and Continuous Squeezing in Quantum Field Theory
A one-parameter family of flat-spacetime vacua, built from Minkowski plane waves with exponential weights, is shown to be a continuous-mode squeezed vacuum with tanh r(ν) = e^(−πν/κ), reducing to the Minkowski vacuum as κ→0.