Does the XY Model have an integrable continuum limit?

Details Does the XY Model have an integrable continuum limit? Does the XY Model have an integrable continuum limit?

2001-06-22

arxiv.org/abs/hep-lat/0106015v3

Nucl.Phys. B618 (2001) 315-370

Physics

High Energy Physics

High Energy Physics - Lattice

69 pages, 18 figures. Equation (3.20) corrected

Scientific paper

10.1016/S0550-3213(01)00487-4

The quantum field theory describing the massive O(2) nonlinear sigma-model is investigated through two non-perturbative constructions: The form factor bootstrap based on integrability and the lattice formulation as the XY model. The S-matrix, the spin and current two-point functions, as well as the 4-point coupling are computed and critically compared in both constructions. On the bootstrap side a new parafermionic super selection sector is found; in the lattice theory a recent prediction for the (logarithmic) decay of lattice artifacts is probed.

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