Holographic RG flows in a 3d gauged supergravity at finite temperature

TL;DR

This paper investigates finite-temperature holographic RG flows in a 3D gauged supergravity, analyzing black hole solutions and their relation to fixed points of dual field theories through dynamical systems and numerical methods.

Contribution

It introduces a dynamical systems approach to analyze finite-temperature holographic RG flows and provides analytical and numerical solutions for black hole configurations.

Findings

Zero-temperature RG flow is the separatrix for black hole solutions with one extremum.

For three extrema, RG flows connect different AdS fixed points.

Near-horizon solutions are analytically derived and a method for full solutions is proposed.

Abstract

In this paper we consider finite-temperature holographic RG flows in $D=3$ $\mathcal{N}=(2,0)$ gauged truncated supergravity coupled to a sigma model with a hyperbolic target space. In the context of the holographic duality, fixed points (CFTs) at finite temperature are described by AdS black holes. We come from the gravity EOM to a 3d autonomous dynamical system, which critical points can be related to fixed points of dual field theories. Near-horizon black hole solutions correspond to infinite points of this system. We use Poincar\'e transformations to project the system on $\mathbf{R}^3$ into the 3d unit cylinder such that the infinite points are mapped onto the boundary of the cylinder. We explore numerically the space of solutions. We show that the exact RG flow at zero temperature is the separatrix for asymptotically AdS black hole solutions if the potential has one extremum, while for the potential with three extrema the separatrices are RG flows between AdS fixed points. We find near-horizon analytical solutions for asymptotically AdS black holes using the dynamical equations. We also present a method for constructing full analytical solutions.