Variational principle of counting statistics in master equations

Details Variational principle of counting statistics in master equations Variational principle of counting statistics in master equations

2009-06-29

arxiv.org/abs/0906.5187v1

Phys. Rev. E 80, 012101 (2009)

Physics

Condensed Matter

Statistical Mechanics

4 pages, no figure

Scientific paper

We study counting statistics of number of transitions in a stochastic process. For mesoscopic systems, a path integral formulation for the counting statistics has already been derived. We here show that it is also possible to derive the similar path integral formulation without the assumption of mesoscopic systems. It has been clarified that the saddle point method for the path integral is not an approximation, but a valid procedure in the present derivation. Hence, a variational principle in the counting statistics is naturally derived. In order to obtain the variational principle, we employ many independent replicas of the same system. In addition, the Euler-Maclaurin formula is used in order to connect the discrete and continuous properties of the system.

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