On Dumb Holes and their Gravity Duals

TL;DR

This paper explores the analogy between supersonic fluid flows creating acoustic horizons and their gravity duals, using the fluid-gravity correspondence to analyze quasinormal modes and thermal radiation in charged conformal fluids.

Contribution

It introduces a new class of acoustic dumb holes in charged conformal fluids and constructs their gravity duals via the fluid-gravity correspondence.

Findings

Identification of acoustic horizons in charged conformal fluids.

Construction of dual gravity solutions for these dumb holes.

Demonstration of thermal spectra in quasinormal modes.

Abstract

Inhomogeneous fluid flows which become supersonic are known to produce acoustic analogs of ergoregions and horizons. This leads to Hawking-like radiation of phonons with a temperature essentially given by the gradient of the velocity at the horizon. We find such acoustic dumb holes in charged conformal fluids and use the fluid-gravity correspondence to construct dual gravity solutions. A class of quasinormal modes around these gravitational backgrounds perceive a horizon. Upon quantization, this implies a thermal spectrum for these modes.