# Magnetoacoustic and Alfve'nic Black Holes with Hawking Radiation at Horizons Made of Magnephonons and Alphonons

## TL;DR

This paper proposes a new type of analogue black holes based on magnetohydrodynamics, which trap magnetoacoustic and Alfvén waves, emitting Hawking radiation composed of quantized vibrations called magnephonons and Alphonons, with potential laboratory creation.

## Contribution

It introduces magnetoacoustic and Alfvénic black holes as novel analogue models, detailing their theoretical properties and potential experimental realization using magnetic fields and fluid flows.

## Key findings

- Hawking temperature depends on magnetic field, density, and tube radius.
- Estimated Hawking temperature is approximately 0.0266 K.
- Proposes laboratory setup for creating these analogue black holes.

## Abstract

We introduce analogue black holes (BHs) based on ideal magnetohydrodynamic equations. Similar to acoustic BHs, which trap phonons and emit Hawking radiation (HR) at the sonic horizon where the flow speed changes from super- to sub-sonic, in the horizon of magnetoacoustic and Alfv\'{e}nic BHs, the magnetoacoustic and Alfve'n waves will be trapped and emit HR made of quantized vibrations similar to phonons which we call magnephonons and Alphonons. We proposed that magnetoacoustic and Alfve'nic BHs may be created in the laboratory using a tube with variable cross section embedded in a uniform magnetic field, and a super-magnetoacoustic or a super-Alfve'nic flow. We show that the Hawking temperature for both BHs is a function of the background magnetic field, number density of fluid, and radius of the tube. For a typical setup, the temperature is estimated to be about 0.0266 K.