Non-trivial θ-vacuum effects in the 2-d O(3) model

被引：17

作者：

Boegli, M. ^{[1
]}

Niedermayer, F. ^{[1
]}

Pepe, M. ^{[2
]}

Wiese, U-J. ^{[1
]}

机构：

[1] Univ Bern, Inst Theoret Phys, Albert Einstein Ctr Fundamental Phys, CH-3012 Bern, Switzerland

[2] Ist Nazl Fis Nucl, Sez Milano Bicocca, I-20126 Milan, Italy

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2012年 / 04期

关键词：

Nonperturbative Effects; Lattice Quantum Field Theory; Sigma Models; TOPOLOGICAL SUSCEPTIBILITY; CLUSTER SIMULATION; TBA EQUATIONS; SIGMA-MODELS; MONTE-CARLO; SPECTRUM; CHARGE; GAP; QCD;

D O I：

10.1007/JHEP04(2012)117

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We study theta-vacua in the 2-d lattice O(3) model using the standard action and an optimized constraint action with very small cut-off effects, combined with the geometric topological charge. Remarkably, dislocation lattice artifacts do not spoil the non-trivial continuum limit at theta not equal 0, and there are different continuum theories for each value 0 <= theta <= pi. A very precise Monte Carlo study of the step scaling function indirectly confirms the exact S-matrix of the 2-d O(3) model at theta = pi.

引用

页数：10

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