What question did this study set out to answer?

This paper aims to clarify the implications of the JWST overmassive black hole population on the CDM-only direct collapse mass ceiling.

June 8, 2026Open Access

Paper CCLXV: The Galoppo-Bruni-Harada CDM-Curvature Direct-Collapse Ceiling at 10⁶ Mₛun Sharpens the Case for OOB Vortex-Seeded LRDs — A 1. 5-2. 5 dex Gap Between the CDM Ceiling and the Confirmed JWST Overmassive Population (CCLX + CCLXI)

Key Points

This paper aims to clarify the implications of the JWST overmassive black hole population on the CDM-only direct collapse mass ceiling.
Derived seed-mass output of CDM-only direct collapse using general-relativistic solutions in a LambdaCDM background.
Analyzed the confirmed overmassive black hole population using dynamical measurements from JWST and synthesized findings with existing literature.
Finds significant gaps between observed overmassive black holes and the CDM-only mass ceiling of 10^6 M_sun.
Proposes that vortex-seeded mechanisms can account for black holes exceeding this ceiling.
Generates forward predictions regarding seed mass distributions and operational gaps in future statistical measurements.

Abstract

Galoppo, Bruni and Harada (arXiv: 2605. 30145, 2026) derive the seed-mass output of CDM-only direct collapse using exact general-relativistic solutions (Lemaitre-Tolman-Bondi and quasi-spherical Szekeres) on primordial curvature peaks in a pressureless-dust LambdaCDM background, finding seeds of mass 10³ - 10⁶ Mₛun forming at z > 5 with core collapse beginning at 10 1 systems. We observe that the JWST overmassive LRD population now directly confirmed by the Juodzbalis et al. (Nature 653: 1017-1021, 2026) dynamical measurement of A2744-QSO1 at z = 7. 04 with MBH = 5 x 10⁷ Mₛun and MBH/Mₛtar > 2 (Paper CCLX), and characterised at population scale on N = 16 z > 5 broad-line AGN with 100% above the Reines-Volonteri 2015 local relation and a median offset of +1. 84 dex (Paper CCLXI), sits at log MBH >~ 7. 5 -- i. e. , 1. 5 to 2. 5 dex ABOVE the Galoppo CDM-only ceiling. Their result sharpens, rather than threatens, the case for the framework's vortex-seeded direct-collapse mechanism (Paper CLVII Prediction-5; Paper CLVIII Section 3. 2). Vortex seeding in primordial G₂ vortex sites produces 10⁷. 5 - 10⁸. 5 Mₛun seeds via brane-current pre-organisation of gas above the Freeman threshold (Sigmacrit -> 0), with no UV-source requirement. After Galoppo et al. , the empirical case is: standard CDM closes the small-seed sector at 10⁶ Mₛun; the observed LRD overmassive population lives entirely above this ceiling; OOB CLVII is currently the only mechanism in the literature that closes both the mass-scale constraint and the MBH/Mₛtar > 1 constraint simultaneously. Three forward predictions: (CCLXV-P1) bimodal log Mₛeed distribution with Galoppo peak at log M ~ 5-6 and CLVII peak at log M ~ 7. 5-8. 5, gap at 6. 5-7. 5 should be under-populated in deep COSMOS-Web + Roman statistics within 2 years; (CCLXV-P2) kinematic distinguishability via host rotational support; (CCLXV-P3) the 10⁶. 5 - 10⁷. 5 Mₛun gap should not fill at the >30% level in samples of N >= 100. Short positioning paper, no new framework derivation. Honest open items: (a) first-principles derivation of vortex-enclosed-mass scale from K (7) systolic geometry still open; (b) Galoppo paper does not address late-time MBH-Mₛtar co-evolution. Framework count: 266 numbered papers. Part of the One-Octonion Brane-Bulk Framework series. Anchor DOI: 10. 5281/zenodo. 19120873. Community: one-octonion-brane-bulk. Author: Bharathi Dasan Jagadeesan, M. D. , University of Minnesota. ORCID: 0000-0002-1143-941X.

Paper CCLXV: The Galoppo-Bruni-Harada CDM-Curvature Direct-Collapse Ceiling at 10⁶ Mₛun Sharpens the Case for OOB Vortex-Seeded LRDs — A 1. 5-2. 5 dex Gap Between the CDM Ceiling and the Confirmed JWST Overmassive Population (CCLX + CCLXI)

Key Points

Abstract

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