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arXiv 2002.07652hep-th
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$O(N)^3$张量场论中的共形对称与复合算子

Conformal Symmetry and Composite Operators in the $O(N)^3$ Tensor Field Theory

Dario Benedetti, Razvan Gurau, Kenta Suzuki

摘要:

我们继续研究了具有四次相互作用和长程传播子的玻色子$O(N)^3$模型。对称群允许三种不同的不变$ϕ^4$复合算子,称为四面体,枕形和双迹。如arXiv:1903.03578和arXiv:1909.07767中所示,四面体算子在大- $N$极限中恰好是边缘的,并且对于纯虚四面体耦合,对于另外两个耦合,发现了一条实红外不动点线(由四面体耦合的绝对值参数化)。这些不动点具有实临界指数和双线性算子的实谱,满足么正性约束。这就提出了一个问题,尽管四面体耦合是虚构的,但在大的- $N$模型是否是酉的。在本文中,我们首先通过不同的正则化和重整化方案重新推导上述结果。然后我们讨论了复合算子的算子混合,并采用长程伊辛模型的类似证明,给出了该模型在红外不动点处共形不变性的微扰证明.最后,我们识别了不动点上的标度算子,并计算了$ϕ^4$和$ϕ^2$复合算子的两点和三点函数。相关性具有预期的共形行为和OPE系数都是真实的,加强了大- $N$ CFT是酉的主张。

英文摘要:

We continue the study of the bosonic $O(N)^3$ model with quartic interactions and long-range propagator. The symmetry group allows for three distinct invariant $ϕ^4$ composite operators, known as tetrahedron, pillow and double-trace. As shown in arXiv:1903.03578 and arXiv:1909.07767, the tetrahedron operator is exactly marginal in the large-$N$ limit and for a purely imaginary tetrahedron coupling a line of real infrared fixed points (parametrized by the absolute value of the tetrahedron coupling) is found for the other two couplings. These fixed points have real critical exponents and a real spectrum of bilinear operators, satisfying unitarity constraints. This raises the question whether at large-$N$ the model is unitary, despite the tetrahedron coupling being imaginary. In this paper, we first rederive the above results by a different regularization and renormalization scheme. We then discuss the operator mixing for composite operators and we give a perturbative proof of conformal invariance of the model at the infrared fixed points by adapting a similar proof from the long-range Ising model. At last, we identify the scaling operators at the fixed point and compute the two- and three-point functions of $ϕ^4$ and $ϕ^2$ composite operators. The correlations have the expected conformal behavior and the OPE coefficients are all real, reinforcing the claim that the large-$N$ CFT is unitary.

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