A First-Quantized Formalism for Cosmological Particle Production

Details A First-Quantized Formalism for Cosmological Particle Production A First-Quantized Formalism for Cosmological Particle Production

2003-11-19

arxiv.org/abs/hep-th/0311180v2

JHEP0407:024,2004

Physics

High Energy Physics

High Energy Physics - Theory

18 pages, LaTeX; v2: significantly revised for clarity; conclusions unchanged

Scientific paper

10.1088/1126-6708/2004/07/024

We show that the amount of particle production in an arbitrary cosmological background can be determined using only the late-time positive-frequency modes. We don't refer to modes at early times, so there is no need for a Bogolubov transformation. We also show that particle production can be extracted from the Feynman propagator in an auxiliary spacetime. This provides a first-quantized formalism for computing particle production which, unlike conventional Bogolubov transformations, may be amenable to a string-theoretic generalization.

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