Analogue non-Riemannian black holes in vortical moving plasmas

TL;DR

This paper explores analogue black holes in vortical moving plasmas using non-Riemannian spacetime models, demonstrating horizons, Hawking radiation, and Lorentz invariance breaking due to effective torsion.

Contribution

It extends the concept of acoustic torsion to non-Riemannian spacetime in plasma flows, introducing artificial black holes and analyzing their properties.

Findings

Horizon formation in vortical plasma flows

Hawking radiation depends on magnetic field and permeability

Effective Lorentz invariance is broken by torsion

Abstract

Analogue black holes in non-Riemannian effective spacetime of moving vortical plasmas described by moving magnetohydrodynamic (MHD) flows. This example is an extension of acoustic torsion recently introduced in the literature (Garcia de Andrade,PRD(2004),7,64004), where now the presence of artificial black holes in moving plasmas is obtained by the presence of an horizon in the non-Riemannian spacetime. Hawking radiation is computed in terms of the background magnetic field and the magnetic permeability. The metric is singular although Cartan analogue torsion is not necessarily singular. The effective Lorentz invariance is shown to be broken due to the presence of effective torsion in strong analogy with the Riemann-Cartan gravitational case presented recently by Kostelecky (PRD 69,2004,105009).