DENSITY MATRIX FORMALISM, DOUBLE-SPACE AND THERMO FIELD DYNAMICS IN NON-EQUILIBRIUM DISSIPATIVE SYSTEMS
1991 ◽
Vol 05
(11)
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pp. 1821-1842
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Keyword(s):
General relationship among the density matrix formalism, the double-space formulation and thermo field dynamics is discussed in non-equilibrium dissipative quantum systems. The concept of weakly equivalent operators in the double space formulation is introduced to review many well-known results and it is shown to be useful in mapping between the density matrix formalism and the double space formulation. A new non-equilibrium thermo field dynamics is formulated to discuss dissipative quantum systems. A simple example of damped harmonic oscillators is discussed in the present representation.
2003 ◽
Vol 01
(02)
◽
pp. 269-278
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Keyword(s):
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2016 ◽
Vol 3
(3)
◽
pp. 203-220
Keyword(s):
2011 ◽
Vol 11
(2)
◽
pp. 317-323
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Keyword(s):
2012 ◽
Vol 170
(3)
◽
pp. 354-375
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Keyword(s):