Flat holography and Carrollian fluids

TL;DR

This paper develops a flat holography framework by taking the zero cosmological constant limit of AdS holography, revealing how Carrollian geometry and fluids emerge on the boundary of Ricci-flat spacetimes.

Contribution

It introduces a novel boundary data structure involving Carrollian geometry and fluid observables, and reconstructs Ricci-flat spacetimes from this data using a flat derivative expansion.

Findings

Carrollian geometry naturally arises in flat holography.

Reconstruction of Ricci-flat spacetimes from boundary data is achieved in closed form.

Dualities between fluid friction tensors and geometric data are established.

Abstract

We show that a holographic description of four-dimensional asymptotically locally flat spacetimes is reached smoothly from the zero-cosmological-constant limit of anti-de Sitter holography. To this end, we use the derivative expansion of fluid/gravity correspondence. From the boundary perspective, the vanishing of the bulk cosmological constant appears as the zero velocity of light limit. This sets how Carrollian geometry emerges in flat holography. The new boundary data are a two-dimensional spatial surface, identified with the null infinity of the bulk Ricci-flat spacetime, accompanied with a Carrollian time and equipped with a Carrollian structure, plus the dynamical observables of a conformal Carrollian fluid. These are the energy, the viscous stress tensors and the heat currents, whereas the Carrollian geometry is gathered by a two-dimensional spatial metric, a frame connection and a scale factor. The reconstruction of Ricci-flat spacetimes from Carrollian boundary data is conducted with a flat derivative expansion, resummed in a closed form in Eddington-Finkelstein gauge under further integrability conditions inherited from the ancestor anti-de Sitter set-up. These conditions are hinged on a duality relationship among fluid friction tensors and Cotton-like geometric data. We illustrate these results in the case of conformal Carrollian perfect fluids and Robinson-Trautman viscous hydrodynamics. The former are dual to the asymptotically flat Kerr-Taub-NUT family, while the latter leads to the homonymous class of algebraically special Ricci-flat spacetimes.