Comment on the paper "Quasi-particle approach for lattice Hamiltonians with large coordination numbers" by P. Navez, F. Queisser and R. Schützhold - J. Phys. A: Math. Theor. 47 225004 (2014)

This comment regards a central aspect of the referred-to paper, the issue of convergence of the large coordination-number expansion. Perturbation expansions of expressions containing a large number of parameters are generally invalid due to the non-analyticity of the expanded expressions. I refer to...

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Veröffentlicht in:	arXiv.org 2017-09
1. Verfasser:	Psiachos, D
Format:	Artikel
Sprache:	eng
Schlagworte:	Convergence Coordination numbers
Online-Zugang:	Volltext
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