$λ$ -上半平面的变形
$λ$-deformations in the upper-half plane
摘要:
我们将$λ$ -变形的$σ$ -模型表示为上半平面中的QFT。对于不同的边界条件,我们计算关联函数的电流和主要运营商,正是在变形参数$λ$和大值的水平$k$的基础WZW模型。要执行我们的计算,我们使用保形微扰理论与卡迪的加倍技巧,以及亚纯参数和非微扰对称的参数空间$(λ,k)$,或标准QFT技术的基础上的自由场扩展的$σ$模型的行动,与自由场遵守适当的边界条件。这两种方法都有自己的优势,产生一致的和丰富的,相比,在没有边界,互补的结果。我们特别注意,虽然不是唯一的,可积性保持边界条件。
英文摘要:
We formulate $λ$-deformed $σ$-models as QFTs in the upper-half plane. For different boundary conditions we compute correlation functions of currents and primary operators, exactly in the deformation parameter $λ$ and for large values of the level $k$ of the underlying WZW model. To perform our computations we use either conformal perturbation theory in association with Cardy's doubling trick, as well as meromorphicity arguments and a non-perturbative symmetry in the parameter space $(λ,k)$, or standard QFT techniques based on the free field expansion of the $σ$-model action, with the free fields obeying appropriate boundary conditions. Both methods have their own advantages yielding consistent and rich, compared to those in the absence of a boundary, complementary results. We pay particular attention, albeit not exclusively, to integrability preserving boundary conditions.
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