Stationary Phase and the Theory of Measurement -- 1/N expansion --

Details Stationary Phase and the Theory of Measurement -- 1/N expansion -- Stationary Phase and the Theory of Measurement -- 1/N expansion --

2008-10-31

arxiv.org/abs/0810.5622v1

Prog. Theor. Phys. 122 (2009), 1405-1432

Physics

Quantum Physics

14 pages

Scientific paper

10.1143/PTP.122.1405

The measuring process is studied, where a macroscopic number N of particles in the detector interact with the object. The macrovariable accompanies the stationary phase in the path-integral form, which is in one-to-one correspondence with the eigen-value of the object operator O to be measured. When N goes to infinity, the fluctuation of the object between different eigenvalues of O is suppressed, frozen to one the same state while the detector is on. A model is studied which produces the ideal result when N is infinite, and the correction terms are calculated in powers of 1/N. It is identical to the expansion including the fluctuation of the object successively.

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