Dumb Hole Associated with an Oscillating Bubbles Cluster

TL;DR

This paper demonstrates that an oscillating bubbles cluster can form a dumb hole by creating an inhomogeneous fluid with a spherical acoustic lens, mimicking black hole properties.

Contribution

It introduces the concept of a dumb hole formed by a bubbles cluster acting as an acoustic lens with unique inhomogeneous fluid dynamics.

Findings

Bubbles clusters can behave like dumb holes under specific conditions.

The fluid becomes inhomogeneous and forms a spherical acoustic lens.

The cluster can shrink to mimic black hole properties.

Abstract

In this paper, it is shown that in interaction with an oscillating bubbles cluster the fluid becomes inhomogeneous. The radial variation of the acoustic refractive index of the fluid generates an acoustic lens with spherical symmetry. When the focal length of the lens associated with the bubbles cluster is equal to the length of the position vector then the bubbles cluster behaves like a dumb hole. Unlike the properties of a bubble, the cluster, by compression under the action of attractive internal forces, can shrink its radius to become a dumb hole.