RG study of a non local sine-Gordon model

Details RG study of a non local sine-Gordon model RG study of a non local sine-Gordon model

2002-12-02

arxiv.org/abs/hep-th/0212019v2

Nucl.Phys. B663 (2003) 591-604

Physics

High Energy Physics

High Energy Physics - Theory

15 pages, 4 figures. Revised version, accepted for publication in Nuclear Physics B

Scientific paper

10.1016/S0550-3213(03)00374-2

We study a non local version of the sine-Gordon model connected to a many-body system with backward and umklapp scattering processes. Using renormalization group methods we derive the flow equations for the couplings and show how non locality affects the gap in the spectrum of charge-density excitations. We compare our results with previous predictions obtained through the self-consistent harmonic approximation.

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