It is well-known that a supermembrane in the light-cone gauge has a continuous spectrum and is unstable. Physical interpretation of this instability is that a supermembrane can have a long thin tube without cost of energy and consequently it becomes a spiky configuration in which multiple membranes are connected by thin tubes. On the other hand, the ABJM model was proposed as a low-energy description of multiple M2-branes in the static gauge. It is natural that an M2-brane is also unstable in this gauge if we believe the physical picture in the light-cone gauge. In order to examine this, we construct a BPS solution explicitly both in the Nambu-Goto action of a supermembrane in the static gauge and in the U(1){\times}U(1) ABJM model, which represents intersecting M2-branes. Since this configuration is regarded as a single M2-brane emitting another one, we study the instability of an M2-brane by analyzing fluctuations around it. We show that a zero mode exists which can deform the configuration. For comparison, we also examine a similar configuration on the D2-brane and check that it does not have such zero modes under a fixed string charge. Furthermore we confirm that the novel Higgs mechanism translates our BPS solution in the ABJM model into that in the D2-brane world volume theory, where the winding number of the former around the fixed point of the orbifold becomes the number of strings ending on the D2-brane in the latter.
BPS bound states, supermembranes, and T-duality in M-theory
这是对II型超弦理论BPS束缚态的11维描述以及超膜在M理论中的作用的介绍性评论。第一部分描述了11维超引力的经典解，这些解在降维和T对偶下给出了IIA和IIB型弦论的NS-NS和R-R p-膜的束缚态。在某些情况下（例如IIB型弦论的（q_1，q_2）弦束缚态），这些非微扰的对象允许用基本2-膜进行简单的11维描述。计算了这类2-膜的BPS激发，并表明与BPS（q_1，q_2）弦束缚态的质谱完全匹配。相同束缚态的不同11 d表示可以用来提供振荡BPS态的不等价（T-对偶）描述。这允许测试T-对偶超越微扰理论，并在某些情况下，以逃避膜不稳定性去一个稳定的T-对偶表示。最后，我们总结了一些结果，这些结果表明在模参数空间的哪些区域，R ^9 x T ^2上的M理论的超膜描述似乎是足够的。
We investigate several aspects of BPS latitude Wilson loops in gauge theories in three dimensions with $\mathcal{N}\ge 4$ supersymmetry. We derive a matrix model for the bosonic latitude Wilson loop in ABJM using supersymmetric localization, and show how to extend the computation to more general Chern-Simons-matter theories. We then define latitude type Wilson and vortex loop operators in theories without Chern-Simons terms, and explore a connection to the recently derived superalgebra defining local Higgs and Coulomb branch operators in these theories. Finally, we identify a BPS loop operator…
BPS Wilson loops in $\mathcal N \geq 2$ superconformal Chern-Simons-matter theories
在$\mathcal N \geq 2$超共形Chern-Simons-matter理论中，我们构造了Bogomol'nyi-Prasad-Sommerfield（BPS）威尔逊圈的无限族，它与标量和费米子物质具有常数参量耦合，包括Minkowski时空中的线威尔逊圈和欧氏空间中的圆威尔逊圈.我们发现最一般的BPS威尔逊圈的联络不能用双结点联络来分解。此外，如果矩阵包含三角形，它不能被解释为超代数中的超矩阵。然而，对于参数的特定选择，它简化为Aharony-Bergman-Jafferis-Maldacena（ABJM）理论中的1/6 BPS威尔逊圈和$\mathcal N = 4$轨道折叠ABJM理论中的1/4 BPS威尔逊圈的众所周知的连接。在$\mathcal N = 2$ orbifold ABJM理论的特殊情况下，我们确定了一个子集的运营商的重力场。通过研究费米和玻色子BPS威尔逊圈的期望值，在量子水平上研究了它们的上同调等价性，并找到了强有力的证据证明了在框架1下，上同调等价性在量子力学上成立.最后，我们讨论了一个更强的配方的上同调等价，这意味着非平凡的身份关联函数的复合运营商在缺陷CFT定义的威尔逊轮廓，并允许作出新的预测，相应的未知积分，要求确认。
ABJM theory in the presence of a half-BPS domain wall is dual to the D2-D4 probe brane system with nonzero worldvolume flux. The ABJM domain wall was recently shown to be integrable to lowest order in perturbation theory and bond dimension. In the present paper we show that the string theory dual of this system is integrable, namely that the string boundary conditions on the probe D4-brane preserve the integrability of the Green-Schwarz sigma model. Our result suggests that the ABJM domain wall is integrable to all loop orders and for any value of the bond dimension.
Strong coupling dynamics of defect RG flows in ABJM
Facultad de Ingeniería, Universidad San Sebastián（圣塞巴斯蒂安大学工程学院）；Dipartimento di Fisica, Università degli Studi di Milano–Bicocca and INFN, Sezione di Milano–Bicocca（米兰比可卡大学物理系及意大利国家核物理研究所米兰比可卡分部）；International Institute of Physics, Federal University of Rio Grande do Norte（北里奥格兰德联邦大学国际物理研究所）
We construct supersymmetric solutions of $D=11$ supergravity, preserving 1/4 of the supersymmetry, that are holographically dual to ABJM theory which has been deformed by spatially varying mass terms depending on one of the two spatial directions. We show that the BPS equations reduce to the Helmholtz equation on the complex plane leading to rich classes of new solutions. In particular, the construction gives rise to infinite classes of supersymmetric boomerang RG flows, as well as generalising a known Janus solution.
We study local operator insertions on 1/2-BPS line defects in ABJM theory. Specifically, we consider a class of four-point correlators in the CFT$_1$ with SU$(1, 1|3)$ superconformal symmetry defined on the 1/2-BPS Wilson line. The relevant insertions belong to the short supermultiplet containing the displacement operator and correspond to fluctuations of the dual fundamental string in AdS$_4 \times \mathbb{C}\textrm{P}^3$ ending on the line at the boundary. We use superspace techniques to represent the displacement supermultiplet and we show that superconformal symmetry determines the four-po…
M2 brane in AdS$_4\times S^7/\mathbb Z_k$: 2-loop correction to $\frac{1}{2}$-BPS Wilson loop vs localization in ABJM theory
Università del Salento（萨伦托大学）；INFN - sezione di Lecce（意大利国家核物理研究所莱切分部）；Abdus Salam Centre for Theoretical Physics, Imperial College London（伦敦帝国理工学院阿卜杜斯·萨拉姆理论物理中心）；ITMP of MSU（莫斯科国立大学理论与数学物理研究所）；Lebedev Inst.（列别捷夫研究所）
We study the BPS counting functions (free energies) of the M-string configurations. We consider separated M5-branes along with M2-branes stretched between them, with M5-branes acting as domain walls interpolating different configurations of M2-branes. We find recursive structure in the free energies of these configurations. The M-string degrees of freedom on the domain walls are interpreted in terms of a pair of interacting supersymmetric WZW models. We also compute the elliptic genus of the M-string in a toy model of the ABJM theory and compare it with the M-theory computation.
