Operational realization of quantum vacuum ambiguities

Abstract

We provide a reinterpretation of the quantum vacuum ambiguities that one encounters when studying particle creation phenomena due to an external and time-dependent agent. We propose a measurement-motivated understanding: Each way of measuring the number of created particles selects a particular vacuum. This point of view gives a clear and physical meaning to the time evolution of the number of particles produced by the agent as the counts in a specific detector and, at the same time relates commonly used quantization prescriptions to particular measurement setups.

arXiv comment6 pages, 3 figures

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• Cosmological Particle Creation Using an Equal-Time Wigner Formalism