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Particle detectors from localized quantum field theories

2024; American Physical Society; Volume: 109; Issue: 4 Linguagem: Inglês

10.1103/physrevd.109.045013

2470-0037

T. Rick Perche, José Polo-Gómez, Bruno de S. L. Torres, Eduardo Martín-Martínez,

Black Holes and Theoretical Physics

We present a fully relativistic model for localized probes in quantum field theory. Furthermore, we show that it is possible to obtain particle detector models from localized quantum field theories that interact with a free quantum field. In particular, a particle detector model is obtained when one traces out over inaccessible degrees of freedom of the localized field. This gives rise to a particle detector model, that is, a quantum degree of freedom that couples to a free field theory in an extended region of spacetime. Moreover, we show that the predictions of traditional particle detector models and fully relativistic localized fields completely coincide to leading order in perturbation theory.