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Quantum Fields in Curved Space by P. C. W. Davies, N. D. Birrell

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6

Stress-tensor renormalization

In previous chapters the production of quanta by a changing gravitational field was studied in detail. It was pointed out that only in exceptional circumstances does the particle concept in curved space quantum field the usual conception of the quantity of matter present. theory correspond closely to the intuitive physical picture of a subatomic particle. In general, no natural definition of particle exists, and particle detectors will respond in a variety of ways that bear no simple relation to

For some purposes it is advantageous to study the expectation values of other observables. Part of the problem with the particle concept concerns the fact that it is defined globally, in terms offield modes, and so is sensitive ...

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