Abstract
The evaluation of observables in the flow equation framework is the concept that tends to be most unfamiliar by comparison with traditional many-body methods. It introduces novel ideas that take some time getting used to, but this is well worth the effort. In fact, the flow equation approach is particularly useful for evaluating observables like correlation functions. In this chapter we introduce the necessary tools, and then use them to discuss two simple models in Sect. 3.3 in full pedagogical detail.
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References
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A.C. Hewson: The Kondo Problem to Heavy Fermions, 1st edn (Cambridge University Press, Cambridge 1993)
S. Kehrein and A. Mielke, Ann. Phys. (NY) 252, 1 (1996)
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Kehrein, S. (2006). Evaluation of Observables. In: The Flow Equation Approach to Many-Particle Systems. Springer Tracts in Modern Physics, vol 217. Springer, Berlin, Heidelberg . https://doi.org/10.1007/3-540-34068-8_3
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DOI: https://doi.org/10.1007/3-540-34068-8_3
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-34067-6
Online ISBN: 978-3-540-34068-3
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