AdS/CFT correspondence for the $O(N)$ invariant critical ${\phi }^4$ model in 3-dimensions by the conformal smearing

Abstract

We investigate a structure of a 4-dimensional bulk space constructed from the $O(N)$ invariant critical ${\phi }^4$ model in 3-dimension using the conformal smearing. We calculate a bulk metric corresponding to the information metric and the bulk-to-boundary propagator for a composite scalar field ${\phi }^2$ in the large $N$ expansion. We show that the bulk metric describes an asymptotic AdS space at both UV (near boundary) and IR (deep in the bulk) limits, which correspond to the asymptotic free UV fixed point and the Wilson-Fisher IR fixed point of the 3-dimensional ${\phi }^4$ model, respectively. The bulk-to-boundary scalar propagator, on the other hand, encodes ${\Delta }_{{\phi }^2}$ (the conformal dimension of ${\phi }^2$) into its $z$ (a coordinate in the extra direction of the AdS space) dependence. Namely it correctly reproduces not only ${\Delta }_{{\phi }^2}=1$ at UV fixed point but also ${\Delta }_{{\phi }^2}=2$ at the IR fixed point for the boundary theory. Moreover, we confirm consistency with the GKP-Witten relation in the interacting theory that the coefficient of the $z^{{\Delta }_{{\phi }^2}}$ term in $z\to 0$ limit agrees exactly with the two-point function of ${\phi }^2$ including an effect of the ${\phi }^4$ interaction. }

arXiv comment25 pages, 3 figures, published version in JHEP, discussion on the relation to F-theorem added with new figures and references

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