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arXiv 2005.10843hep-th
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4天$\mathcal{N}=4$ SYM中$\frac{1}{16}$-BPS指数的增长

The growth of the $\frac{1}{16}$-BPS index in 4d $\mathcal{N}=4$ SYM

Sameer Murthy

摘要:

研究了4dPDMATHABMN U(N)超Yang-Mills(SYM)理论中$N=2\,,\dots,10$算子的Hamilton指数.结果表明,在Cardy极限下,大电荷渐近性与解析结果一致,与对偶AdS中超对称黑洞的熵一致.数值结果也与大N解析结果一致,从而为指数的精确公式提供了线索。然后,我们证明,使用表示论的思想,对于小于2(N+1)的电荷(以整数单位量化)的值,该指数与多引力子指数完全一致,然后开始偏离较大的电荷。因此,U(N)SYM指数在小电荷的多引力子值和大电荷的黑洞生长之间插值。

英文摘要:

We study the Hamiltonian index of $\frac{1}{16}$-BPS operators in 4d $\mathcal{N}=4$ U(N) super Yang-Mills (SYM) theory numerically for $N=2\,,\dots,10$. We show that the large-charge asymptotics agree with analytic results in the Cardy-like limit, as consistent with the entropy of supersymmetric black hole in the dual AdS. The numerics also agree with the large-N analytic result, thus providing hints towards an exact formula for the index. We then prove, using ideas from representation theory, that for values of charges (quantized in integer units) less than 2(N+1) the index agrees precisely with the multi-graviton index, and then begins to deviate for larger charges. Thus the U(N) SYM index interpolates between multi-graviton values at small charge and black hole growth at large charges.

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