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arXiv 1708.02244hep-th
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精细D1/D5 BPS谱的对称性

Symmetries of the refined D1/D5 BPS spectrum

Nathan Benjamin, Sarah M. Harrison

摘要:

我们研究了对称轨道折叠CFT Sym $^N(M)$变形到超引力点的大$N$ 1/4-BPS谱,其中包括$M= K3$和$T^4$ .我们考虑了超共形代数的左移和右移$SU(2)_R$对称下的加细,并将谱分解为代数的特征标。我们发现,在大$N$的字符分解满足一个不寻常的性质,其中的简并度只取决于一定的线性组合的左,右移动的量子数,这表明更深的对称结构。此外,我们认为这些退化的离散对称群的行动,其中某些子组的康威组是已知的发挥作用。我们还评论的潜力较大的离散对称群出现在大$N$限制。

英文摘要:

We examine the large $N$ 1/4-BPS spectrum of the symmetric orbifold CFT Sym$^N(M)$ deformed to the supergravity point in moduli space for $M= K3$ and $T^4$. We consider refinement under both left- and right-moving $SU(2)_R$ symmetries of the superconformal algebra, and decompose the spectrum into characters of the algebra. We find that at large $N$ the character decomposition satisfies an unusual property, in which the degeneracy only depends on a certain linear combination of left- and right-moving quantum numbers, suggesting deeper symmetry structure. Furthermore, we consider the action of discrete symmetry groups on these degeneracies, where certain subgroups of the Conway group are known to play a role. We also comment on the potential for larger discrete symmetry groups to appear in the large $N$ limit.

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