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arXiv 1004.3053hep-latcond-mat.str-elcond-mat.supr-conhep-th
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非紧QED3中耦合到四费米相互作用的手征对称性破缺和非线性动力学

Chiral symmetry breaking and monopole dynamics in non-compact QED3 coupled to a four-fermi interaction

Wesley Armour, John B. Kogut, Costas Strouthos

摘要:

本文给出了N_f四分量费米子味与弱Z(2)手征不变四费米相互作用耦合的三维非紧量子电动力学(QED 3)的首次晶格模拟结果。用$N_f \ge 4$计算结果表明,强耦合手征跃迁或尖锐交叉附近的标度由3dGross Neveu紫外稳定的重整化群不动点决定. N_f=4临界指数与Gross Neveu临界指数的微小偏差暗示了规范场动力学产生的非零费米子质量可能被四费米耦合增强的证据。在弱的四费米耦合和大的N_f值下,标度区被抑制。测量i)一个极化率,这是极化率的极化配置,和ii)孤立的单极子的密度,意味着对于$N_f \ge 1$和弱规范耦合的单极子不影响理论的限制属性,因为他们被屏蔽。

英文摘要:

We present results from the first lattice simulations of three dimensional non-compact quantum electrodynamics (QED3) with N_f four-component fermion flavors coupled to a weak Z(2) chirally invariant four-fermi interaction. Results with $N_f \ge 4$ show that the scaling near the strong coupling chiral transition or sharp crossover is determined by the 3d Gross Neveu ultraviolet-stable renormalization group fixed point. Small deviations of the N_f=4 critical exponents from the respective Gross Neveu ones, hint at evidence for non-zero fermion mass generated by the gauge fields dynamics that might have been enhanced by the four-fermi coupling. It is also shown that the scaling region is suppressed at weak four-fermi couplings and large N_f values. Measurements of i) a monopole susceptibility which is the polarizability of the monopole configurations, and ii) the density of isolated monopoles, imply that for $N_f \ge 1$ and weak gauge couplings the monopoles do not affect the theory's confining properties, because they are shielded.

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