Cumulant Expansions and the Spin-Boson Problem

Abstract

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.

26 pages, LaTex

References in corpus (2)

• Low-temperature dynamical simulation of spin-boson systems
• Rigorous mean field model for CPA: Anderson model with free random variables

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