A Projection Operator Method in the Heisenberg Picture
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概要
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A projection operator method in Heisenberg picture is developed. Corresponding to the equations for the reduced density matrix, there are two types of Langevin-like equations; time con-volution (TC) and time convolutionless (TCL) equations. When the whole system is composedof relevant system and irrelevant system, unnecessary information is eliminated by projectionoperator. Explicit expansion formulae are obtained for the both types of equations. Relaxationoperators and fluctuating forces are expressed in terms of certain cumulants. The method isillustrated by simple examples.
- 社団法人日本物理学会の論文
- 1996-11-15
著者
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Nemoto Kae
The Doctoral Research Course In Human Culture Ochanomizu University
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Shibata Fumiaki
Department Of Physices Faculty Of Science Ochanomizu University
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