Relativistic causality in particle detector models: Faster-than-light signalling and "Impossible measurements"

• URL: http://arxiv.org/abs/2102.03408v2
• Date: Wed, 4 Aug 2021 15:40:49 GMT
• Title: Relativistic causality in particle detector models: Faster-than-light signalling and "Impossible measurements"
• Authors: Jos\'e de Ram\'on, Maria Papageorgiou and Eduardo Mart\'in-Mart\'inez
• Abstract summary: We study the relation between faster-than-light signaling and the causal factorization of the dynamics for multiple detector-field interactions. We show in what way spatially extended non-relativistic detector models predict superluminal propagation of the field's initial conditions. We discuss the validity of measurements in QFT when performed with non-relativistic particle detectors.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We analyze potential violations of causality in Unruh DeWitt-type detector models in relativistic quantum information. We proceed by first studying the relation between faster-than-light signaling and the causal factorization of the dynamics for multiple detector-field interactions. We show in what way spatially extended non-relativistic detector models predict superluminal propagation of the field's initial conditions. We draw parallels between this characteristic of detector models, stemming from their non-relativistic dynamics, and Sorkin's "impossible measurements on quantum fields" arXiv:gr-qc/9302018. Based on these features, we discuss the validity of measurements in QFT when performed with non-relativistic particle detectors.

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