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arXiv 2005.06480hep-th
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从Hagedorn到Lee-Yang:有限$N$下$\mathcal{N}=4$ SYM理论的配分函数

From Hagedorn to Lee-Yang: Partition functions of $\mathcal{N}=4$ SYM theory at finite $N$

Alexander T. Kristensson, Matthias Wilhelm

摘要:

我们研究了R × S^3上具有规范群U(N)的极大超对称杨-米尔斯理论的热力学,它与AdS_5 × S^5上的IIB型超弦理论是对偶的。虽然这两个理论都是众所周知的表现出哈格多恩行为在无限N,我们发现的证据表明,这是由李-杨行为在大,但有限N:的配分函数的零点凝聚成两个弧在复杂的温度平面,捏实轴的约束-解除禁闭过渡的温度。具体地说,我们证明了这一点的自由理论,通过精确计算(未精化和精化)配分函数在N<=7的su(2)部门包含两个复杂的标量,以及在N<=5的su(2| 3)包含3个复标量和2个费米子的扇区。为了得到这些明确的结果,我们使用一个莫里安-外尔公式任意字段内容,利用等价的配分函数与什么是已知的数学家作为庞加莱系列的迹代数的一般矩阵。通过这个Molien-Weyl公式,我们还可以为更大的行业生成准确的结果。

英文摘要:

We study the thermodynamics of the maximally supersymmetric Yang-Mills theory with gauge group U(N) on R x S^3, dual to type IIB superstring theory on AdS_5 x S^5. While both theories are well-known to exhibit Hagedorn behavior at infinite N, we find evidence that this is replaced by Lee-Yang behavior at large but finite N: the zeros of the partition function condense into two arcs in the complex temperature plane that pinch the real axis at the temperature of the confinement-deconfinement transition. Concretely, we demonstrate this for the free theory via exact calculations of the (unrefined and refined) partition functions at N<=7 for the su(2) sector containing two complex scalars, as well as at N<=5 for the su(2|3) sector containing 3 complex scalars and 2 fermions. In order to obtain these explicit results, we use a Molien-Weyl formula for arbitrary field content, utilizing the equivalence of the partition function with what is known to mathematicians as the Poincare series of trace algebras of generic matrices. Via this Molien-Weyl formula, we also generate exact results for larger sectors.

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