Parallel evolution from primordial initial conditions: a phenomenological seed+shell framework for black holes and high-redshift galaxies v.2.0_Main

This record provides the Version 2.0 (English) of the main article on the “seed+shell” parallel–evolution framework for high–redshift black holes and galaxies. Version 2.0 presents a complete rewrite of the original manuscript. The theoretical framework is reorganised with a clearer definition of the population parameter and of the phase diagram , and with the explicit integration of Test 1 (empirical calibration of ) and the new numerical Test 3 on the distribution of . The former B0/B1/B2 sub–families are merged into a single B family, and the purely toy–Monte Carlo Test 4 has been removed, retaining only constraints supported by real JWST data. A complete ApJ–style bibliography is included, and in–text citations have been harmonised. This English Version 2.0 is the reference version for circulation and submission and is the direct scientific translation of the updated Italian Version 2.0 of the same work. Zenodo (DOI: 10.5281/zenodo.17770997 (see “View all versions”). A companion technical note with the full description of the numerical tests and Monte Carlo experiments is available separately on Zenodo (DOI: 10.5281/zenodo.17793829).