Holographic Fisher Information Metric in Schr\"odinger Spacetime

TL;DR

This paper explores the holographic Fisher information metric in Schr"odinger spacetime, demonstrating its divergence structure matches the dual non-relativistic quantum field theory near the boundary, extending holographic principles to non-relativistic cases.

Contribution

It extends the holographic Fisher information metric analysis to Schr"odinger spacetime, showing boundary divergence matches dual quantum theory, and discusses missing boundary information for bulk reconstruction.

Findings

Holographic Fisher information metric diverges near boundary.

Matching divergence structure with dual quantum theory.

Insights into boundary data needed for bulk reconstruction.

Abstract

In this paper we study the Fisher information metric on the space of the coupling constants on both sides of the duality between non-relativistic dipole field theories and string theory in Schr\"odinger spacetime. We consider the following setup. In the gauge theory side one can deform a given conformal field theory by a proper scalar operator and compute the quantum information metric via the two-point correlation function between two such operators. On the string side the deformation corresponds to a scalar field probing the background. In the large $N$ limit of the theory the probing can be done without backreaction on the original spacetime, thus one can construct a perturbative scheme for the calculation of the dual holographic Fisher information metric as shown by \cite{Trivella:2016brw}. Considering the asymptotic behaviour of the holographic Fisher information metric close to the boundary of the Schr\"odinger spacetime we show that its divergence structure exactly matches its dual quantum counterpart up to the leading order, thus extending the holographic setup up to the non-relativistic case. One should note that the existence of other terms are not seen from the boundary theory to this level of approximation. Their behaviour near the boundary however, is pointing what kind of information from the boundary theory is missing to be able to reconstruct the bulk. Obviously more work is needed to refine and elucidate their meaning and interrelations in holographic setup.