Renormalization Group, Hidden Symmetries and Approximate Ward Identities in the Xyz Model, Ii
نویسندگان
چکیده
An expansion based on renormalization group methods for the spin correlation function in the z direction of the Heisenberg-Ising XY Z chain with an external magnetic field directed as the z axis is derived. Moreover, by using the hidden symmetries of the model, we show that the running coupling constants are small, if the coupling in the z direction is small enough, that a critical index appearing in the correlation function is exactly vanishing (because of an approximate Ward identity) and other properties, so obtaining a rather detailed description of the XY Z correlation function.
منابع مشابه
Renormalization Group, Hidden Symmetries and Approximate Ward Identities in the Xyz Model, I
Using renormalization group methods, we study the Heis-enberg-Ising XY Z chain in an external magnetic field directed as the z axis, in the case of small coupling J 3 in the z direction. We study the asymptotic behaviour of the spin space-time correlation function in the direction of the magnetic field and the singularities of its Fourier transform. The work is organized in two parts. In the pr...
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