arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1406.7255hep-th
收藏

N=2* 理论中的模anomaly方程及其大N极限

Modular anomaly equations in N=2* theories and their large-N limit

M. Billo, M. Frau, F. Fucito, A. Lerda, J. F. Morales, R. Poghossian, D. Ricci Pacifici

摘要:

我们提出了一个在Ω背景下,具有规范群U(N)的R^4上N=2* 超杨-米尔斯理论的前势的模反常方程。然后,我们研究的行为的预势在一个大N的限制,其中N走向无穷大的规范耦合常数保持不变。在这种情况下,瞬子不受抑制。我们着重讨论了规范理论真空的两种典型选择,其中标量场的真空期望值是均匀分布的或符合维格纳半圆定律的。在这两种情况下,我们推导出一个全瞬子精确公式的prepotential。作为应用,我们证明了在大N时S^4上的规范理论配分函数在真空期望值的维格纳分布附近局部化,从而得到一个非常简单的表达式,其中瞬子贡献变得与耦合常数无关。

英文摘要:

We propose a modular anomaly equation for the prepotential of the N=2* super Yang-Mills theory on R^4 with gauge group U(N) in the presence of an Omega-background. We then study the behaviour of the prepotential in a large-N limit, in which N goes to infinity with the gauge coupling constant kept fixed. In this regime instantons are not suppressed. We focus on two representative choices of gauge theory vacua, where the vacuum expectation values of the scalar fields are distributed either homogeneously or according to the Wigner semi-circle law. In both cases we derive an all-instanton exact formula for the prepotential. As an application, we show that the gauge theory partition function on S^4 at large N localises around a Wigner distribution for the vacuum expectation values leading to a very simple expression in which the instanton contribution becomes independent of the coupling constant.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑