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arXiv 2107.02230hep-thcond-mat.stat-mechmath-phmath.MP
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伊辛模型的$T \bar{T}$变形及其紫外完备化

$T \bar{T}$ deformation of the Ising model and its ultraviolet completion

André LeClair

摘要:

纯$T\bar{T}$变形的共形场论一般是渐近不完整的紫外线(UV)由于平方根奇异性的基态能量的圆柱圆周$R$,这样的理论是病态的距离短于一些临界$R_*$。在这篇文章中,我们将展示如何一个理论可以完成,如果一个包括一个无限数量的额外的无关扰动。这一点在红外(IR)的$c_{IR}= 1/2$的伊辛模型中得到了充分的证明,在那里我们发现了两个中心电荷的完全化$c_{UV} = 3/2$和$c_{UV} = 7/10$,后者是三临界的伊辛模型.这两个紫外完备都具有${\cal N}=1$超对称性,在重整化群流中被破坏到低能量。我们还考虑了自由无质量玻色子的多重$T\bar{T}$变形,其中我们无法找到与c定理一致的UV完备。对于违反c定理的负耦合$g$,在两种情况下我们都发现$c_{UV} = -c_{IR}$为$g \to -\infty$。最后我们还研究了非临界伊辛模型的纯$T\bar{T}$形变。

英文摘要:

Pure $T\bar{T}$ deformations of conformal field theories are generally asymptotically incomplete in the ultra-violet (UV) due to square-root singularities in the ground state energy on a cylinder of circumference $R$, such that the theory is ill-defined for distances shorter than some critical $R_*$. In this article we show how a theory can be completed if one includes an infinite number of additional irrelevant perturbations. This is fully demonstrated in the case of the Ising model at $c_{IR}= 1/2$ in the infra-red (IR), where we find two completions with central charges $c_{UV} = 3/2$ and $c_{UV} = 7/10$, the latter being the tri-critical Ising model. Both of these UV completions have ${\cal N}=1$ supersymmetry which is broken in the renormalization group flow to low energies. We also consider multiple $T\bar{T}$ deformations of a free massless boson, where we cannot find a UV completion that is consistent with the c-theorem. For negative coupling $g$, which violates the c-theorem, in both cases we find $c_{UV} = -c_{IR}$ as $g \to -\infty$. Finally we also study pure $T\bar{T}$ deformations of the off-critical Ising model.

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