IDEA NOTE (T285). NOTHING IS DERIVED. Records a hypothesis at the OPENING of an investigation, with its gate named and its kill-condition stated in advance, so the idea is timestamped and falsifiable rather than merely suggestive. Tags: CONJECTURE / IDEA NOTE / NOT DERIVED / KILL-CONDITION STATED. === DESCRIPTION (abstract) === Photonic Universe Hypothesis (PUH) — Idea Note. Beginning of an investigation. THE HYPOTHESIS. PUH's filed "Skeleton Solar System" (T196) — primordial Planck cores ejected by the Rebound, held together by mutual gravity, later accreting gas to grow stars and planets — admits a SCALE-UP. A "Skeleton Galaxy" would be a galaxy-scale population of primordial cores whose gas never arrived: the gravitating structure is present, but the star formation that normally accompanies it did not occur. THE FRAMING CORRECTION AT THE CENTRE. Dragonfly 44 is routinely called "dark-matter-dominated", which invites the misreading that it is unusually RICH in dark matter. It is not a low-mass object either. van Dokkum et al. (2016; ApJL 828, L6; arXiv: 1606. 06291) report a dynamical mass of order 1e10 solar masses within the half-light radius, a mass-to-light ratio of order tens, and an inferred halo mass comparable to the Milky Way's — while its stellar mass is only of order 1e8 solar masses. A later spatially-resolved study (arXiv: 1904. 04838) revised the dispersion downward but left the picture intact. DF44's halo is NOT anomalous; what is anomalous is how FEW STARS it made with it. The original authors note that an object of this mass is not expected to be nearly dark, since galaxy formation is thought most efficient in exactly this regime. DF44 is therefore best read as STAR-POOR, not dark-matter-rich. The skeleton arrived; the flesh did not. THE MACHINERY PUH ALREADY HAS. In T196, cores are not born inside stars — they are born FIRST, in the Rebound event, and the stars come later, from GAS, in a separate stage T196 calls the "gas condensation epoch". Star formation in PUH is a TWO-STAGE process: first the core arrives, then the gas does. The archive adds that every gravitationally bound body carries such a core (T161, T197) and that rocky-planet formation requires core seeding (T198). The observation generating this note is simply that THE SECOND STAGE CAN FAIL. If cores arrive and gas does not, PUH's own machinery predicts a structure that gravitates without shining. The framework already contains, unremarked, the recipe for a dark galaxy. WHAT THE HYPOTHESIS WOULD BUY. (1) Star-poor galaxies become PREDICTED rather than anomalous: a structure with cores and no gas is one of the outcomes the two-stage mechanism naturally produces, so the existence of the UDG class becomes support for the picture rather than a puzzle for it. (2) A possible shape for the UDG DICHOTOMY: alongside star-poor, mass-rich systems like DF44 sit NGC 1052-DF2 and DF4, whose dispersions are consistent with their STELLAR MASS ALONE — galaxies apparently LACKING dark matter, with closely similar stellar masses and morphologies. PUH's core-first ontology suggests the two classes would differ in the history of their free-core population, not in their stellar content — but this note DOES NOT develop that account and does not claim it; it is recorded as a target. (3) A NON-BARYONIC dark component, for free: the chief historical objection to compact-object dark matter is that ordinary compact objects are baryons and Big Bang nucleosynthesis fixes the baryon budget too tightly. PUH's cores are not baryons — they are folded lattice, produced in the Rebound, i. e. BEFORE nucleosynthesis. That objection does not apply to them. This is not a fix introduced to evade the constraint; it follows from the framework's existing chronology. THE GATE, NAMED HONESTLY. The hypothesis rests on a quantity PUH has NOT derived, and the archive says so in its own words: among the things the core-formation papers explicitly DO NOT claim is "a derivation of the rebound mass spectrum". That same open quantity gates the core-to-host-mass relation and the critical mass for failed supernovae. The Skeleton Galaxy has therefore not wandered into a side-question — it has arrived at a keystone the framework had already identified and left standing. Until the spectrum is derived, it is NOT known and NOT asserted here how much mass the Rebound placed in cores too light ever to gather gas, how much in cores heavy enough to seed stars, or what fraction of a Skeleton Galaxy's mass is dark. THE KILL-CONDITION (T285-1), stated in advance per the T280 discipline. Write the primordial core mass function as dN/dM ~ M^ (-alpha). The mass in any interval scales as the integral of M^ (1-alpha). If alpha > 2, the mass is dominated by the LIGHT end — cores too small ever to gather gas, permanently dark — and the hypothesis is viable. If alpha < 2, the mass follows the HEAVY star-seeding end, un-accreted light cores carry a negligible fraction, and THE SKELETON GALAXY HYPOTHESIS IS DEAD. A derivation of the rebound mass spectrum yielding alpha < 2 falsifies this note. (It is observed, WITHOUT weight being placed on it, that the stellar initial mass function — the only part of the heavy tail nature lets us measure, if stellar masses track their seeds — has a slope steeper than 2. Whether the light end shares that slope is exactly what is unknown. ) NOT CLAIMED: that anything is derived; that DF44 is explained (only that it is the KIND of object the two-stage mechanism would produce) ; that dark matter is solved (entirely contingent on the undelivered spectrum) ; or any priority over existing accounts — the UDG population is currently a testing ground for both particle dark matter and modified-gravity approaches, the latter including recent non-minimal-coupling work (arXiv: 2602. 14747), cited to locate this proposal in a contested field, not endorsed. This is the beginning of an investigation, and is filed as such: to timestamp the idea, fix its gate, and state its kill-condition, so that whatever follows can be measured against what was claimed at the outset.
Brian Martell (Sun,) studied this question.