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arXiv 2302.04887hep-thmath-phmath.MP
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关于超共形指数的巨引力子展开式的注记

Comments on the Giant-Graviton Expansion of the Superconformal Index

Dan Stefan Eniceicu

摘要:

Gaiotto和Lee,以及Imamura和合作者的工作表明,$U(N)$规范理论的超共形指数应该可以表示为一个收敛级数,其项是相关的$U(k)$规范理论的指数,这些规范理论实现为$k$巨引力子膜堆的世界体积理论。Murthy提供的指数的另一种扩展被证明是非常普遍的,但与第一次扩展的联系并不清楚。我们研究了这两个扩展之间的关系,并提出了一个处方提取的条款的第一系列的第二。我们遵循这个处方的情况下,$1/2$-BPS指数,并表明,第一次扩展的$m$的第一项的贡献是完全编码在第二个$m$条款。此外,我们还将第二次展开式中的$m$项与超行列式的$N$次幂在$U(m|m)$超酉矩阵积分中的期望值相对应,这暗示了该项的膜/反膜起源.

英文摘要:

Work by Gaiotto and Lee, and by Imamura and collaborators suggests that the superconformal index of $U(N)$ gauge theory should be expressible as a convergent series whose terms are indices of associated $U(k)$ gauge theories realized as the worldvolume theories of stacks of $k$ giant-graviton branes. A different expansion for the index provided by Murthy was shown to hold very generally, but the connection to the first expansion was not immediately clear. We study the relation between the two expansions and propose a prescription for extracting the terms of the first series from those of the second. We follow this prescription in the case of the $1/2$-BPS index and show that the contribution of the $m$th term of the first expansion is fully encoded in the first $m$ terms of the second. In addition, we identify the $m$th term of the second expansion with the expectation value of the $N$th power of the superdeterminant in a $U(m|m)$ superunitary matrix integral, which hints at a brane/anti-brane origin for the term.

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