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arXiv 1908.07476hep-thhep-lat
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连续二维$U(N)$规范理论中的拓扑效应

Topological effects in continuum 2d $U(N)$ gauge theories

Claudio Bonati, Paolo Rossi

摘要:

我们研究了定义在紧致流形上的二维$U(N)$规范理论的连续极限对$θ$的依赖性,特别强调了球形($g=0$)和环形($g=1$)拓扑。我们发现,$U(1)$和$SU(N)$自由度之间的耦合生存的连续极限,导致可观察到的偏差的连续拓扑磁化率从$U(1)$的行为,特别是对于$g=0$,在这种情况下,即使在大的$N$限制的偏差仍然存在。

英文摘要:

We study the $θ$ dependence of the continuum limit of 2d $U(N)$ gauge theories defined on compact manifolds, with special emphasis on spherical ($g=0$) and toroidal ($g=1$) topologies. We find that the coupling between $U(1)$ and $SU(N)$ degrees of freedom survives the continuum limit, leading to observable deviations of the continuum topological susceptibility from the $U(1)$ behavior, especially for $g=0$, in which case deviations remain even in the large $N$ limit.

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