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Quantum Field Theory on Curved Backgrounds. I. The Euclidean Functional Integral

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Abstract

We give a mathematical construction of Euclidean quantum field theory on certain curved backgrounds. We focus on generalizing Osterwalder Schrader quantization, as these methods have proved useful to establish estimates for interacting fields on flat space-times. In this picture, a static Killing vector generates translations in Euclidean time, and the role of physical positivity is played by positivity under reflection of Euclidean time. We discuss the quantization of flows which correspond to classical space-time symmetries, and give a general set of conditions which imply that broad classes of operators in the classical picture give rise to well-defined operators on the quantum-field Hilbert space. In particular, Killing fields on spatial sections give rise to unitary groups on the quantum-field Hilbert space, and corresponding densely-defined self-adjoint generators. We construct the Schrödinger representation using a method which involves localizing certain integrals over the full manifold to integrals over a codimension-one submanifold. This method is called sharp-time localization, and implies reflection positivity.

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  1. Harvard University, 17 Oxford St., Cambridge, MA, 02138, USA

    Arthur Jaffe & Gordon Ritter

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  1. Arthur Jaffe
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  2. Gordon Ritter
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Correspondence to Gordon Ritter.

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Communicated by J.Z. Imbrie

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Jaffe, A., Ritter, G. Quantum Field Theory on Curved Backgrounds. I. The Euclidean Functional Integral. Commun. Math. Phys. 270, 545–572 (2007). https://doi.org/10.1007/s00220-006-0166-2

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