The cosine-0.84 pairing between Alemohammad 2026's dilution mechanism and Simkin & Roychowdhury 2005's copying mechanism is an analytical contrast: opposed generative mechanisms for the same concentration curve, one shared higher-order point

citation-analysispreferential-attachmentcitation-monoculturemodel-collapsebibliometricsmechanism-comparisonembedding-false-friendbridge-investigationanalytical-contrast

Seek's semantic index flagged claim-alemohammad-2026-recursive-citation-benchmark-dilution-concentrates-attention and claim-simkin-roychowdhury-2005-random-copying-model-reproduces-preferential-attachment-and-sleeping-beauties as unlinked neighbors at cosine 0.84 [unverified-quant — needs primary; the figure is the task framing's]. No prior capture or note in 30-notes/ adjudicates this exact pair — distinct from the vault's other embedding-false-friend notes, none of which names either slug.

At the mechanism level the pair is a false friend, and a clean one. Both papers report the same surface curve — citation attention on a fixed subset of papers intensifying over repeated rounds — but propose opposed generative mechanisms for it. Simkin & Roychowdhury's model is an explicit branching process: an author copies references from recently-cited papers, so a paper's own accumulated citation count feeds forward into its future citation probability — "this branching process is subcritical," and the premise driving it is that "a majority of scientific citations are copied from the lists of references used in other papers." A paper cited more is, by the model's own construction, more likely to be cited again: compounding, history-dependent cumulative advantage, the same lineage Price (1976) and Merton (1968) formalized for citation inequality generally. Alemohammad et al.'s twelve-round recursive benchmark states the opposite as a designed-in, tested property of its own setup: "Being cited never raises a paper's chance of being shown again" — real papers' selection into future rounds is uniformly random regardless of citation history. What produces the rising per-paper citation rate instead is "what recursion supplies is dilution": each surviving real paper's citation-when-shown rate rises purely because the candidate pool around it fills with AI-generated competitors, not because its own weight compounds. The authors formalize this as Proposition 5.1 ("Heterogeneous rarity amplification") and test it within single rounds — holding time, cohort, and paper identity fixed — finding that a shown seed's citation odds depend on how many other seeds happen to co-occur in its panel, not on the seed's own history. Alemohammad's own related-work section explicitly frames the benchmark against the Price/Merton cumulative-advantage lineage Simkin's model extends, stating that the mechanisms that literature studies — "social, status, visibility, and accumulated count" — are the three the benchmark "removes... by construction" to ask what concentration remains. Simkin's account needs a paper's history; Alemohammad's needs only the current panel's composition. These are mathematically different classes of process, not a paraphrase difference, and the resemblance the embedding caught is a resemblance of curve shape, not cause.

At a higher level a genuine resonance survives the split. Both papers independently establish that concentrated citation attention does not require any actor — human citer or language model — to read, judge, or track a paper's actual merit or accumulated prestige. Simkin & Roychowdhury build this into their model as an explicit non-requirement: citations are copied onto new reference lists while "the paper itself remains unread." Alemohammad et al. build the analogous non-requirement into their experimental design instead — author fame, publication order, citation count, and venue are all stripped or fabricated, and concentration persists anyway. Both are existence proofs that recognition-free selection suffices to produce concentrated attention; they just reach that point by structurally opposed routes — one a compounding copying process, the other a fixed, non-compounding preference reacting to a diluting pool [unverified-synthesis — this verdict, "mechanism-level false friend, higher-order genuine resonance," is Seek's own comparative reading of the two primaries; neither paper states it, and it is not yet checked against a third instance of the same shape].