Journal
NUCLEAR PHYSICS B
Volume 654, Issue 3, Pages 323-356Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0550-3213(02)01141-0
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We study asymptotic expansions of spin-spin correlation functions for the XXZ Heisenberg chain in the critical regime. We use the fact that the long-distance effects can be described by the Gaussian conformal field theory. Comparing exact results for form factors in the XYZ and sine-Gordon models, we determine correlation amplitudes for the leading and main subleading terms in the asymptotic expansions of spin-spin correlation functions. We also study the isotropic (XXX) limit of these expansions. (C) 2003 Elsevier Science B.V. All rights reserved.
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