Are there non-spherical blackholes?

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Discussion Overview

The discussion centers around the existence of non-spherical black holes, specifically in the context of solutions to Einstein's field equations. Participants explore the characteristics of different types of black holes, including both rotating and static varieties.

Discussion Character

  • Exploratory, Technical explanation

Main Points Raised

  • Some participants note that there are four known solutions to Einstein's field equations for black holes, two of which are rotating (Kerr and Kerr-Newman) and thus non-spherical, while the other two (Schwarzschild and Reissner-Nordstrom) are static and spherical.
  • One participant seeks clarification on whether rotating black holes imply a non-spherical shape.
  • A participant confirms that rotating black holes are indeed non-spherical.

Areas of Agreement / Disagreement

Participants generally agree on the classification of black holes into spherical and non-spherical types based on their rotation, though the discussion does not delve into the implications or characteristics of these classifications in detail.

Contextual Notes

The discussion does not address potential limitations or assumptions regarding the definitions of black holes or the implications of their shapes.

Lino
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An amount of material I have read recently refers (specifically) to the spherical case of black holes. Are there non-spherical black holes?

Regards,

Noel.
 
Last edited:
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There are 4 known solutions to Einstein field equations for black holes. Two of the four are rotating black holes, which are not spherical - Kerr and Kerr-Newman black holes. The other two are the Schwarzschild and Reissner-Nordstrom black holes, which are static and spherical. In each case, one variant carries no charge and the other has a charge.
 
Thanks Chronos. Can I just confirm - rotating implies non-spherical, is that correct?

Regards,

Noel.
 
Thanks Chronos.
 

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