Cumulant Expansions and the Spin-Boson Problem

Details Cumulant Expansions and the Spin-Boson Problem Cumulant Expansions and the Spin-Boson Problem

1996-09-05

arxiv.org/abs/cond-mat/9609054v1

Physics

Condensed Matter

26 pages, LaTex

Scientific paper

10.1103/PhysRevE.55.2328

The dynamics of the dissipative two-level system at zero temperature is
studied using three different cumulant expansion techniques. The relative
merits and drawbacks of each technique are discussed. It is found that a new
technique, the non-crossing cumulant expansion, appears to embody the virtues
of the more standard cumulant methods.

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