Defect CFT in the 6d (2,0) theory from M2 brane dynamics in AdS7 × S4

Defect CFT in the 6d (2,0) theory from M2 brane dynamics in AdS7 × S4
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AdS7 – S4 中 M2 膜动力学的 6d (2,0) 理论中的缺陷 CFT

DOI:
10.1007/jhep07(2020)101
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发表时间:
2020
影响因子:
5.4
通讯作者:
Zhou, Xinan
Zhou, Xinan
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Drukker, Nadav;Giombi, Simone;Tseytlin, Arkady A.;Zhou, Xinan

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6d(2,0)理论中的面算符在大N下有M2膜的全息描述,探索AdS 7× S4 M-理论背景。最对称的1/2-BPS算子定义在平面或球面上,它保持一个二维超共形群。这包括,特别是,一个SO(2,2)子群的d共形变换,使表面运营商可以被视为一个共形缺陷的6d理论。对偶M2膜具有AdS 3诱导几何,反映了2d共形对称。在这里,我们使用全息描述提取与表面算子相关的缺陷CFT数据。横向波动的M2膜的频谱被发现是在一对一的对应关系与受保护的多重操作插入表面上,其中包括位移操作。我们计算了M2膜涨落的单圈行列式,并提取了球面的共形反常系数到N 0阶。我们还简要地讨论了从非超对称到1/2-BPS亏损算子的RG流,以及它与亏损CFT的“b-定理”的一致性。从M2膜作用量出发,利用AdS 3维滕图计算了表面算符上的基本玻色插入的4点函数,并从OPE中提取了一些缺陷CFT数据. 4点函数满足超共形Ward恒等式,我们讨论了一个相关的子部门的“扭曲”标量插入,其相关函数的剩余超共形对称性的约束。
Surface operators in the 6d (2, 0) theory at large N have a holographic description in terms of M2 branes probing the AdS 7× S 4 M-theory background. The most symmetric, 1/2-BPS, operator is defined over a planar or spherical surface, and it preserves a 2d superconformal group. This includes, in particular, an SO (2, 2) subgroup of d conformal transformations, so that the surface operator may be viewed as a conformal defect in the 6d theory. The dual M2 brane has an AdS 3 induced geometry, reflecting the 2d conformal symmetry. Here we use the holographic description to extract the defect CFT data associated to the surface operator. The spectrum of transverse fluctuations of the M2 brane is found to be in one-to-one correspondence with a protected multiplet of operator insertions on the surface, which includes the displacement operator. We compute the one-loop determinants of fluctuations of the M2 brane, and extract the conformal anomaly coefficient of the spherical surface to order N 0. We also briefly discuss the RG flow from the non-supersymmetric to the 1/2-BPS defect operator, and its consistency with a “b-theorem” for the defect CFT. Starting with the M2 brane action, we then use AdS 3 Witten diagrams to compute the 4-point functions of the elementary bosonic insertions on the surface operator, and extract some of the defect CFT data from the OPE. The 4-point function is shown to satisfy superconformal Ward identities, and we discuss a related sub-sector of “twisted” scalar insertions, whose correlation functions are constrained by the residual superconformal symmetry.
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