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Prog. Theor. Phys. Vol. 115 No. 1 (2006) pp. 1-22
Linear Response in an Interacting Boson System
Mizuhiko Saeki
Toyama National College of Maritime Technology, Imizu 933-0293, Japan
(Received April 22, 2005)
Abstract:
The TCLE method (a method in which the admittance of a system is
directly calculated from time-convolutionless equations with external driving
terms) formulated in terms of thermo-field dynamics, is applied to a boson
system interacting with its surroundings, referred to as the “heat reservoir",
and with an external driving field. For a boson system interacting with its
heat reservoir, the fluctuation-dissipation theorem, a dispersion relation, and
sum rules are studied through application of the TCLE method. The effects of
the interference between the external driving field and the heat reservoir,
which give the effects of the initial correlation and memory, as well as the
effects of the boson-boson interaction, are numerically investigated for a
non-degenerate boson system interacting with its heat reservoir, up to first
order in powers of the boson-boson interaction.
URL :
http://ptp.ipap.jp/link?PTP/115/1/
DOI : 10.1143/PTP.115.1
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