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arXiv 0910.3594hep-th
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K3上F-理论中的BPS开弦和A-D-E-奇点

BPS Open Strings and A-D-E-singularities in F-theory on K3

Eric A. Bergshoeff, Jelle Hartong

摘要:

我们改进了最近构造的超引力7-膜解的图形表示,并应用这种精细表示重新研究了K3上F-理论中A-D-E-奇点的开弦描述。图形表示的一个值得注意的特点是,它提供了完整的全球分支切割结构的7膜解决方案,在我们的分析中起着重要的作用。我们首先确定那些当重合时导致A-D-E规范群的膜群。接下来我们证明,总是有足够数量的开BPS弦来解释规范群的所有生成元。然而,正如我们将要证明的,一般来说,在BPS弦和规范群生成元之间没有一一对应的关系。对于D_{n+4} -和E-奇点,为了把BPS弦与规范群生成元联系起来,我们分别使D_{n+4} -和E-规范群的SU(n+4)和SU(5)子群显现出来。我们发现,只有对D-系列(和标准的A-系列),这是足以确定,在一对一的方式,BPS字符串对应于规范群生成元。

英文摘要:

We improve on a recently constructed graphical representation of the supergravity 7-brane solution and apply this refined representation to re-study the open string description of the A-D-E-singularities in F-theory on K3. A noteworthy feature of the graphical representation is that it provides the complete global branch cut structure of the 7-brane solution which plays an important role in our analysis. We first identify those groups of branes which when made to coincide lead to the A-D-E-gauge groups. We next show that there is always a sufficient number of open BPS strings to account for all the generators of the gauge group. However, as we will show, there is in general no one-to-one relation between BPS strings and gauge group generators. For the D_{n+4}- and E-singularities, in order to relate BPS strings with gauge group generators, we make an SU(n+4), respectively SU(5) subgroup of the D_{n+4}- and E-gauge groups manifest. We find that only for the D-series (and for the standard A-series) this is sufficient to identify, in a one-to-one manner, which BPS strings correspond to which gauge group generators.

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