The N = 2 $$ \mathcal{N}=2 $$ Schur index from free fermions

The N = 2 $$ \mathcal{N}=2 $$ Schur index from free fermions
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自由费米子的 N = 2 $$ mathcal{N}=2 $$ Schur 指数

DOI:
10.1007/jhep01(2016)167
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发表时间:
2016
影响因子:
5.4
通讯作者:
Bourdier J
Bourdier J
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Bourdier J

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本文研究了四维圆对称理论的Schur指数。我们表明,该指数可以表示为一个加权和分配函数描述系统的自由费米子生活在一个圆圈。对于任意长度的圆形SU(N)箭图,我们评估了指数的大N极限,直到指数抑制校正。对于单结点理论(SYM)和两结点的情形,我们能够超越大N极限,得到指数的完全的、所有阶的大N展开式,以及用椭圆函数表示的显式有限N结果.
We study the Schur index of 4-dimensionalcircular quiver theories. We show that the index can be expressed as a weighted sum over partition functions describing systems of free Fermions living on a circle. For circular SU (N) quivers of arbitrary length we evaluate the large N limit of the index, up to exponentially suppressed corrections. For the single node theory (SYM) and the two node quiver we are able to go beyond the large N limit, and obtain the complete, all orders large N expansion of the index, as well as explicit finite N results in terms of elliptic functions.