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This research analyses the rotational stability of CCEGA black stars and their angular momentum limits.

May 6, 2026Open Access

P51: Rotational Stability of CCEGA Black Stars — Light Ring, Ergoregion, and Angular Momentum Limit

Key Points

This research analyses the rotational stability of CCEGA black stars and their angular momentum limits.
Analytical calculations to verify rotational stability of CCEGA black stars.
Assessment of light ring presence at r = 3GM/c².
Examination of ergoregion behavior within stellar surface for varying mass and spin.
Confirmed stability of CCEGA black stars with mass between 4.56–12.0 M☉.
Identified maximum rotation rate between 0.76–2.0 kHz.
No ergoregion instability found for the models analyzed.

Abstract

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 ρc = 7. 4 ρₙuc. Keywords: CCEGA, black stars, ergoregion instability, light ring, rotation, compact objects, angular momentum

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Marc López Sánchez (Mon,) studied this question.

synapsesocial.com/papers/69faa30204f884e66b5338fd https://doi.org/https://doi.org/10.5281/zenodo.20017879

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