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The density operator p is the quantum analog of the density distribution function p
used to describe the macroscopic state of classical systems. Thus, we say that
the macroscopic state of quantum systems is described by the density operator p.
The quantum Liouville equation given by Eq. (207) can be brought into a form
that more closely resembles the classical Liouville equation by introducing a
quantum Liouville operator i: i = (l/ft)$- (208) where the operator 9t is defined in
such a ...
For this problem, the response function is given by <M') = P(JMJh(»)eq (348)
where 7„ is a current operator. The response function <£M,„(f) describes the
response of the current in the p. direction to an instantaneous electric field
applied in the ...
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Seismology Observational 17 Stochastic Description
Seismology Theoretical 47 Solar Chimneys
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