We consider the partition function of the boundary $OSp(2S+2|2S)$ coset sigma model on an annulus, based on the lattice regularization introduced in the companion paper. Using results for the action of $OSp(2S+2|2S)$ and $B_L(2)$ on the corresponding spin chain, as well as mini-superspace and small $g_σ^2$ calculations, we conjecture the full spectrum and set of degeneracies on the entire critical line. Potential relationship with the $OSp(2S+2|2S)$ Gross-Neveu model is also discussed.
We present homogeneous Yang-Baxter deformations of the AdS$_5\times$S$^5$ supercoset sigma model as boundary conditions of a 4D Chern-Simons theory. We first generalize the procedure for the 2D principal chiral model developed by Delduc et al [arXiv:1909.13824] so as to reproduce the 2D symmetric coset sigma model, and specify boundary conditions governing homogeneous Yang-Baxter deformations. Then the conditions are applicable for the AdS$_5\times$S$^5$ supercoset sigma model case as well. In addition, homogeneous bi-Yang-Baxter deformation is also discussed.
On integrable deformations of superstring sigma models related to AdS_n x S^n supercosets
考虑了AdS_n x S^n超陪集上二维西格玛模型的两个可积变形.第一种是“eta-变形”(基于Yang-Baxter西格玛模型),它是AdS_n x S^n上标准超弦作用量的单参数推广;第二种是“Edda-变形”(基于变形规范WZW模型),它是AdS_n x S^n超弦的非阿贝尔T-对偶的推广。我们表明,eta变形模型可以得到一个特殊的标度限制和解析延拓坐标结合一个特定的识别的参数的两个模型的一个变形的一个。耦合和变形参数之间的关系是一致的解释的第一个模型作为一个真正的量子变形和第二个作为根单位量子变形。对于AdS_2 × S^2的情况,我们探讨了这一极限对超重力背景的影响,这些超重力背景与AdS_2变形模型有关。我们还认为,这两个模型可能形成一个对偶泊松-李对,并在与S^2相关的陪集的可积变形的情况下提供了直接的证据。
Supergravity background of lambda-deformed model for AdS2 x S2 supercoset
从对应于AdS_n x S^n超弦的F/G超陪集模型开始,我们可以将arXiv:1409.1538的σ-模型定义为F/F规范WZW模型的变形,或者定义为AdS_n x S^n超弦西格玛模型关于整个超群F的非阿贝尔T-对偶的可积单参数推广。在这里,我们考虑n=2的情况,并找到PSU(1,1)的四维目标空间背景的显式形式|2)/[SO(1,1)× SO(2)]超陪集。我们表明,这个背景下表示的解决方案IIB型10 d超引力紧致的6-torus与唯一的度量,π和RR 5-形式(表示为2-形式F在4d)是非平凡的。这意味着,在量子水平上,希达模型是外尔不变的,因此定义了一个相容的超弦西格玛模型。我们发现的超引力解与arXiv:1410.1886中的解不同,后者应该对应于一个只规范F的玻色子子群的版本。尽管如此,这两个解决方案具有等效的缩放极限arXiv:1504.07213,导致度量和e^Phi F的等距背景,其与arXiv:1309.5850的η变形的AdS_2 x S^2西格玛模型相关。在AdS_3 x S^3和AdS_5 x S^5的情况下,预期得到类似的结果。
We study the dual description of the $η$-deformed $OSP(N|2m)$ sigma model in the asymptotically free regime ($N>2m+2$). Compared to the case of classical Lie groups, for supergroups there are inequivalent $η$-deformations corresponding to different choices of simple roots. For a class of such deformations we propose the system of screening charges depending on a continuous parameter $b$, which defines the $η$-deformed $OSP(N|2m)$ sigma model in the limit $b\rightarrow\infty$ and a certain Toda QFT as $b\rightarrow0$. In the sigma model regime we show that the leading UV asymptotic of the $η$-d…
Kaluza-Klein gauge and minimal integrable extension of OSp(4|6)/(SO(1,3) x U(3)) sigma-model
基于从AdS_4 x S^7背景上D=11超膜到AdS_4 x CP^3上IIA型超弦的二维约化的经验,我们引入Kaluza-Klein(部分)kappa对称规范作为对D=11监督本因分量的贡献的消失条件,该监督本因分量与D=10时空相切,与参数化紧致第11空间的坐标微分成比例。时间维度,这是确定与超膜世界体积紧凑的尺寸。对于AdS_4 x S^7超膜,卡鲁扎-克莱因规范通过对它们施加D=3(反)马约拉纳条件,去掉了与8个时空超对称性相关的格拉斯曼坐标的一半,这些超对称性被AdS_4 x CP^3超背景破坏。这一考虑依赖于osp(4)的实现|8)AdS_4 × S^7超背景的等距超代数为D=3 N=8超共形代数。在破缺超对称的扇区中,需要进一步使D=10的非线性子消失,只有两个Grassmann坐标被组织成D=3的(反)Majorana旋量,它定义了OSp(4)的最小SL(2,R)-协变扩张|6)/(SO(1,3)× U(3))西格玛模型。在这种最小扩张的4种可能性中,我们详细考虑了其中一种,即对应于挑选出与破缺的庞加莱超对称性有关的D=3的Majorana坐标,并证明了在这种部分κ对称规范中的AdS_4 × CP^3超弦运动方程是可积的。还讨论了OSp(4)与|6)/(SO(1,3)× U(3))西格玛模型和AdS_4 × CP^3超弦的关系。
Two-dimensional $O(N)$ non-linear sigma models are exactly solvable theories and have many applications, from statistical mechanics to their use as QCD toy models. We consider a supersymmetric extension, the non-linear sigma model on the supersphere~$S^{N+2m-1|2m}\equiv \frac{OSP(N+2m|2m)}{OSP(N+2m-1|2m)}$. We briefly describe its renormalization properties and lattice discretization, and present a strategy for numerical simulations together with some preliminary numerical results.
Deformations of $T^{1,1}$ as Yang-Baxter sigma models
我们考虑一族变形T^{1,1}在杨巴克斯特西格玛模型的方法。我们首先讨论T^{1,1}的超陪集描述,它表明了空间的完全对称性,并导出了标准的Sasaki-Einstein度规。其次,我们考虑T^{1,1}的三参数变形,通过使用经典的r-矩阵满足经典的Yang-Baxter方程(CYBE)。由此得到的度量和NS-NS两种形式与TsT变换得到的度量和NS-NS两种形式完全一致,并包含Lunin-Maldacena背景作为特例。值得注意的是,对于AdS_5 x T^{1,1},整个扇区的经典可积性被认为是丢失的。因此,我们的结果表明,杨巴克斯特西格玛模型的方法是适用的,即使是不可积陪集。这一观察表明,重力/CYBE对应可以扩展到可积的情况之外。
We review the algebraic approach to super non-Abelian T-Duality considered in [1], focusing on symmetric and semi-symmetric coset spaces on $G/H$. We discuss a potential impediment, appearing in these models when integrating out the gauge field in favour of the dual variables. This process cannot be performed in general and we isolate the obstruction, highlighting three cases in which a solution can be found. After writing the T-dual action we provide solution for two specific models. The first based on the symmetric space $S^{3} \simeq SO(4)/SO(3)$, well-known in the literature, the second on…