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Ergospheres are a property of black holes, and do neutron stars have it? If yes, why seldom article mentions that; if no, why can't neutron stars have this ergosphere component?

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Neutron stars are generally not compact enough to have an ergosphere. Typically, the radius of a neutron star is several times the Schwarzschild radius corresponding to its mass. The ergosphere however starts at the Schwarzschild radius.

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  • $\begingroup$ Well, thank you @mmeent, i see. $\endgroup$
    – Chen
    Commented Nov 29, 2020 at 10:15
  • $\begingroup$ In addition, one could say that any object compact enough to have an ergosphere automatically become a black hole. $\endgroup$
    – jng224
    Commented Nov 29, 2020 at 14:27
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    $\begingroup$ @Jonas It is not so simple, since the horizon radius of a spinning black hole can be as small as half the Schwarzschild radius. $\endgroup$
    – TimRias
    Commented Nov 29, 2020 at 15:30

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