Schr\"odinger Holography with and without Hyperscaling Violation

TL;DR

This paper explores Schr"odinger holography with various dynamical and hyperscaling exponents, revealing novel entanglement entropy behaviors and proposing a minimal surface prescription, with implications for dual field theories and string theory embeddings.

Contribution

It introduces a new prescription for minimal surfaces in Schr"odinger holography and uncovers entanglement entropy violations across different parameter regimes.

Findings

Area law for entanglement entropy is violated for certain z ranges.

Entanglement entropy shows a transition from logarithmic to volume law.

Dual field theories may exhibit phases with Fermi surfaces.

Abstract

We study the properties of the Schr\"odinger-type non-relativistic holography for general dynamical exponent z with and without hyperscaling violation exponent \theta. The scalar correlation function has a more general form due to general z as well as the presence of \theta, whose effects also modify the scaling dimension of the scalar operator. We propose a prescription for minimal surfaces of this "codimension 2 holography," and demonstrate the (d-1) dimensional area law for the entanglement entropy from (d+3) dimensional Schr\"odinger backgrounds. Surprisingly, the area law is violated for d+1 < z < d+2, even without hyperscaling violation, which interpolates between the logarithmic violation and extensive volume dependence of entanglement entropy. Similar violations are also found in the presence of the hyperscaling violation. Their dual field theories are expected to have novel phases for the parameter range, including Fermi surface. We also analyze string theory embeddings using non-relativistic branes.