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arXiv 1407.4574hep-th
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精确重整化群与高自旋全息

The Exact Renormalization Group and Higher-spin Holography

Robert G. Leigh, Onkar Parrikar, Alexander B. Weiss

摘要:

在本文中,我们重温标量场理论在$d$时空维度具有$U(N)$全球对称性。在我们最近的工作arXiv:1402.1430v2之后,我们考虑了所有$U(N)$不变的单迹算子在自由不动点的关联函数的生成函数。精确的重整化群方程被转换为在一个更高维的模型时空中径向演化的Hamilton方程,在这种情况下是$AdS_{d+1}$。与RG方程相关联的几何被认为是自然出现的无限喷束对应的场论,并建议他们的解释为更高的自旋运动方程。虽然我们得到的高自旋方程非常简单,但它们在本质上是非定域的。然而,解决这些散装运动方程的边界源,我们得出的壳作用,并证明它正确地编码所有的关联函数的场论,写为“威滕的”。由于模型时空具有不动点的等距性,因此有可能构建新的更高自旋的理论,这些理论是根据其他模型时空的几何结构来定义的。我们说明了这一点,明确地构建相应的$z=2$非相对论自由场理论在$D$空间维度的高自旋RG方程。在这种情况下,模型时空是薛定谔时空,$Schr_{D+3}$。

英文摘要:

In this paper, we revisit scalar field theories in $d$ space-time dimensions possessing $U(N)$ global symmetry. Following our recent work arXiv:1402.1430v2, we consider the generating function of correlation functions of all $U(N)$-invariant, single-trace operators at the free fixed point. The exact renormalization group equations are cast as Hamilton equations of radial evolution in a model space-time of one higher dimension, in this case $AdS_{d+1}$. The geometry associated with the RG equations is seen to emerge naturally out of the infinite jet bundle corresponding to the field theory, and suggests their interpretation as higher-spin equations of motion. While the higher-spin equations we obtain are remarkably simple, they are non-local in an essential way. Nevertheless, solving these bulk equations of motion in terms of a boundary source, we derive the on-shell action and demonstrate that it correctly encodes all of the correlation functions of the field theory, written as `Witten diagrams'. Since the model space-time has the isometries of the fixed point, it is possible to construct new higher spin theories defined in terms of geometric structures over other model space-times. We illustrate this by explicitly constructing the higher spin RG equations corresponding to the $z=2$ non-relativistic free field theory in $D$ spatial dimensions. In this case, the model space-time is the Schrödinger space-time, $Schr_{D+3}$.

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