Relativistic quantum measurement

Details Relativistic quantum measurement Relativistic quantum measurement

2002-03-15

arxiv.org/abs/gr-qc/0203056v2

Phys.Rev. D66 (2002) 023510

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

9 pages, no figures: Revision: references added

Scientific paper

10.1103/PhysRevD.66.023510

Does the measurement of a quantum system necessarily break Lorentz invariance? We present a simple model of a detector that measures the spacetime localization of a relativistic particle in a Lorentz invariant manner. The detector does not select a preferred Lorentz frame as a Newton-Wigner measurement would do. The result indicates that there exists a Lorentz invariant notion of quantum measurement and sheds light on the issue of the localization of a relativistic particle. The framework considered is that of single-particle mechanics as opposed to field theory. The result may be taken as support for the interpretation postulate of the spacetime-states formulation of single-particle quantum theory.

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