Analytical verification shows stability and angular momentum limits in CCEGA black stars, suggesting no ergoregion instability.
Analytical verification that CCEGA black stars (4.56–12.0 M☉, C ≈ 0.44) are rotationally stable. Light ring confirmed at r = 3GM/c². Ergosphere buried inside stellar surface for all masses at maximum spin. No Friedman (1978) ergoregion instability. Maximum rotation 0.76–2.0 kHz. Stability is structural consequence of ρ_c = 7.4 ρ_nuc.
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Marc López Sánchez (2026) studied this question.
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