Establishes CCEGA black stars' stability against ergoregion instability, indicating a key insight in astrophysics.
We establish rotational stability of CCEGA black stars despite the ergoregion being exterior to the object (C ≈ 0.63–1.27, P51 v2.0). The light ring damping rate exceeds the ergoregion instability rate by a factor γ_LR/γ_ergo ~ 10⁹–10¹². The suppression arises from geometric factors (δr/r_e)⁵ in the ergoregion-surface overlap. CCEGA black stars are rotationally stable for all masses in the range 4.56–14.75 M☉.
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Marc López Sánchez (2026) studied this question.
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