The fields ghost in the renormalization of Lagrangian t-J model
Vol. 3 No. 6 (2011), Natural Sciences and Engineering
Vol. 3 No. 6 (2011)

The fields ghost in the renormalization of Lagrangian t-J model

Natural Sciences and Engineering
https://doi.org/10.21640/ns.v3i6.188
Published 2014-10-29
Oscar P. Zandron
Facultad de Ciencias Exactas, Ingeniería y Agrimensura. Universidad Nacional de Rosario
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Keywords

ghost fields
renormalization procedure
Lagrangian perturbative formalism
t-J model campos fantasmas
proceso de renormalización
formalismo Lagrangiano
modelo t-J

How to Cite

P. Zandron, O. (2014). The fields ghost in the renormalization of Lagrangian t-J model. Nova Scientia, 3(6), 68–94. https://doi.org/10.21640/ns.v3i6.188
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Abstract

The present work treats the role of ghost fields in the renormalization procedure of the Lagrangian perturbative formalism of the t-J model. We show that by introducing proper ghost field variables, the propagator and vertices cam be renormalized to each order. In particular, the renormalized ferromagnetic magnon propagator coming from our previous Lagrangian formalism is studies in detail, and it is shown how the thermal softening of the magnon frequency is predicted by the model. The results are confronted with the previous one obtained by means of the spin-polaron theories.
https://doi.org/10.21640/ns.v3i6.188
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