Emergent ${\text{AdS}}_{d+1}$ Geometry from Functional Renormalization Group via Bulk Metric Reconstruction

Abstract

We present a holographic dual description for the O(N) vector model in $d$-dimensional Euclidean space within the functional renormalization group (FRG) framework. By iterating Wilsonian renormalization group transformations, the extra-dimensional scale coordinate is identified as the radial direction of an emergent $(d+1)$-dimensional bulk spacetime. We construct a bidirectional holographic dictionary in which the emergent bulk metric is determined by the spectrum of the non-perturbative $GG$ polarization function. Using this dictionary we show that as the mass gap decreases, the emergent geometry evolves from a Ricci flat to an Anti-de Sitter $(Ad{S}_{d+1})$ geometry.

Completely rewritten