Magnetoacoustic and Alfvénic black holes

Gheibi, A.; Safari, H.; Innes, Davina

doi:10.1140/epjc/s10052-018-6109-1

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Magnetoacoustic and Alfvénic black holes

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Innes, Davina
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Citation

Gheibi, A., Safari, H., & Innes, D. (2018). Magnetoacoustic and Alfvénic black holes. The European Physical Journal C: Particles and Fields, 78: 662. doi:10.1140/epjc/s10052-018-6109-1.

Cite as: https://hdl.handle.net/21.11116/0000-0003-C28A-6

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 Alfvénic BHs, the magnetoacoustic and Alfvén 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 Alfvénic 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-Alfvénic 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.