Download PDF by Grigori Volovik: Artificial Black Holes

Physics

By Grigori Volovik

ISBN-10: 9810248075

ISBN-13: 9789810248079

Physicists are thinking about at the hazard of simulating black holes within the laboratory by way of numerous ''analog models''. those analog versions, often in line with condensed subject physics, can be utilized to assist us comprehend normal relativity (Einstein’s gravity); conversely, summary ideas built usually relativity can occasionally be used to aid us comprehend convinced features of condensed topic physics. This booklet includes thirteen chapters — written by way of specialists quite often relativity, particle physics, and condensed topic physics — that discover numerous elements of this two-way site visitors.

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The major candidate models for implementing an analogue black hole are: • Acoustic geometries. — Phase oscillations in Bose-Einstein condensates; this special case of the acoustic metric has the particularly nice property that the speed of sound can be as slow as a few millimetres per second [15]. — Bondi-Hoyle spherically symmetric accretion [16]. — Parker wind (solar wind) — coronal outflow from a star [17]; this is more properly viewed as a "white hole". Bondi-Hoyle accretion and Parker wind are particularly interesting in that astrophysicists have high confidence that these systems exist and exhibit acoustic horizons — though detecting direct observational evidence of these horizons may be a little tricky.

If you read the original paper demonstrating the existence of Hawking radiation (the one in Nature [20], compare with [21]), it is easy to see that this derivation does not need or use the Einstein equations. ) Some of the subsequent re-derivations of the Hawking radiation effect (for example, using analytic continuation to Euclidean signature) are technically slicker (and computationally more efficient). The analytic continuation trick applies to an equilibrium situation (strictly speaking, it's not directly relevant to a black hole evaporating into a vacuum), but the central point is that the derivation of the Hawking temperature depends only on the existence of an event horizon with a non-zero surface gravity, and not on the details of how that horizon is generated — again the derivation does not need or use the Einstein equations.

Bondi-Hoyle accretion and Parker wind are particularly interesting in that astrophysicists have high confidence that these systems exist and exhibit acoustic horizons — though detecting direct observational evidence of these horizons may be a little tricky. • Slow light in Bose-Einstein condensates; this is a special case of the "Gordon metric" associated with a flowing dielectric — by sitting near a resonance the speed of light (the group velocity) can be reduced to centimetres per second or less [18].

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Artificial Black Holes by Grigori Volovik


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