This contribution is based on a talk given by the author at the "Dualities and Generalized Geometries" session of the Corfu Summer Institute 2018 workshops. We overview the results of [1], focusing our attention on integrable $λ$-deformations of WZW models with boundaries.
We consider the non-integrable bosonic backgrounds $W_{2,4}\times T^{1,1}$ and $AdS_5\times T^{1,1}$ and derive their bosonic $η$-deformed versions using an $r$-matrix that solves the modified Yang-Baxter equation obtaining new integrable deformed backgrounds.
We consider the three-parameter integrable deformation of the $AdS_3\times S^3$ superstring background constructed in arXiv:1811.00453. Working on the string worldsheet in uniform lightcone gauge, we find the tree-level bosonic S matrix of the model and study some of its limits.
Lie algebra valued equations translating the integrability of a general two-dimensional Wess-Zumino-Witten model are given. We found simple solutions to these equations and identified three types of new integrable non-linear sigma models. One of them is a modified Yang-Baxter sigma model supplemented with a Wess-Zumino-Witten term.
We show that the (torsional) nonrelativistic string sigma models on $ R\times S^2 $ can be mapped into \emph{deformed} Rosochatius like integrable models in one dimension. We also explore the associated Hamiltonian constrained structure by introducing appropriate Dirac brackets. These results show some solid evidence of the underlying integrable structure in the nonrelativistic sector of the gauge/string duality.
We search for integrable boundary conditions and their geometric interpretation as $D$-branes, in models constructed as generalized $λ$-deformations of products of group- and coset-spaces. Using the sigma-model approach, we find that all the conformal brane geometries known in the literature for a product of WZW models solve the corresponding boundary conditions, thus persisting as integrable branes along the RG flows of our sigma-models. They consist of the well known $G$-conjugacy classes, twisted $G$-conjugacy classes by a permutation automorphism (permutation branes) and generalized permut…
We discuss an integrable model of string on AdS$_3$xS$^3$xT$^4$ in a thermodynamical bath. We show that scattering of the excitations above equilibrium states has some novel features. Thermodynamics points to interesting deformation of the original model for which we discuss finite size effect through mirror TBA equations.
We study the approaches to two-dimensional integrable field theories via a six-dimensional(6D) holomorphic Chern-Simons theory defined on twistor space. Under symmetry reduction, it reduces to a four-dimensional Chern-Simons theory, while under solving along fibres it leads to four-dimensional(4D) integrable theory, the anti-self-dual Yang-Mills or its generalizations. From both four-dimensional theories, various two-dimensional integrable field theories can be obtained. In this work, we try to investigate several two-dimensional integrable deformations in this framework. We find that the $λ$-…
Unimodular jordanian deformations of integrable superstrings
我们找到了新的包含超荷的齐次r矩阵,并利用它们找到了杨-巴克斯特变形超弦的新背景。我们得到这些作为单模非齐次r矩阵的极限和AdS 2 x S2 x T6和AdS 5 x S5的相关变形。我们的r矩阵是约简的,但也是幺模的,并导致经常超引力运动方程的解决方案。在一般情况下,我们的变形是等价于特定的非阿贝尔T对偶变换。奇怪的是,我们的一个背景也等价于TsT变换和S对偶变换产生的背景。
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。
We calculate the $\mathcal{S}$-multiplets for two-dimensional Euclidean $\mathcal{N}=(0,2)$ and $\mathcal{N} = (2,2)$ superconformal field theories under the $T\overline{T}$ deformation at leading order of perturbation theory in the deformation coupling. Then, from these $\mathcal{N} = (0, 2)$ deformed multiplets, we calculate two- and three-point correlators. We show the $\mathcal{N} = (0,2)$ chiral ring's elements do not flow under the $T\overline{T}$ deformation. Specializing to integrable supersymmetric seed theories, such as $\mathcal{N} = (2,2)$ Landau-Ginzburg models, we use the thermod…
We build on the results of arXiv:1912.11036 for generalised frame fields on generalised quotient spaces and study integrable deformations for $\mathbb{CP}^n$. In particular we show how, when the target space of the Principal Chiral Model is a complex projective space, a two-parameter deformation can be introduced in principle. The second parameter can however be removed via a diffeomorphism, which we construct explicitly, in accordance with the results stemming from a thorough integrability analysis we carry out. We also elucidate how the deformed target space can be seen as an instance of gen…
An Integrable Deformation of the AdS5 x S5 Superstring
在AdS 5 x S5中,弦的世界片理论的S-矩阵先前已经被证明允许变形,其中对称代数被相关的量子群取代。q为实数的情况被认为是格林-施瓦茨西格玛模型的一种特殊变形。到目前为止,对于q是单位根的情况还缺乏解释。我们证明了Green-Schwarz西格玛模型允许一个离散变形,这个离散变形可以看作是F/F_V规范WZW模型的一个相当简单的变形,其中F=PSU(2,2| 4)。变形参数q则是单位的k次根,其中k是水平。变形理论具有与格林-施瓦茨西格玛模型相同的运动方程,但具有不同的辛结构。我们表明,由此产生的理论是可积的,并有恰到好处的数量的卡帕对称性,出现作为一个残余的原始规范对称性的费米部分。这表明存在一个完全一致的变形弦背景。