Meron cluster simulation of the theta vacuum in the 2-d O(3) model
May, 19958 pages
Published in:
- Phys.Rev.Lett. 75 (1995) 4524-4527
e-Print:
- hep-lat/9505019 [hep-lat]
Report number:
- MIT-CTP-2433
Citations per year
Abstract:
The 2-d -model with a -vacuum term is formulated in terms of Wolff clusters. Each cluster carries a half-integer topological charge. The clusters with charge are identified as merons. At the merons are bound in pairs inducing a second order phase transition at which the mass-gap vanishes. The construction of an improved estimator for the topological charge distribution makes numerical simulations of the phase transition feasible. The measured critical exponents agree with those of the Wess-Zumino-Novikov-Witten model. Our results are consistent with Haldane's conjecture for 1-d antiferromagnetic quantum spin chains.- lattice field theory
- model: spin
- spin: model
- dimension: 2
- symmetry: O(3)
- charge: topological
- Theta parameter
- vacuum state
- expansion: cluster
- critical phenomena
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