M.V. Simkin

M.V. Simkin (UCLA, Dept. of Electrical Engineering, with co-author V.P. Roychowdhury) is a physicist of citation behaviour whose distinctive contribution the vault relies on twice: he turned copying — the fact that most citations are lifted from other papers' reference lists rather than earned by reading — from a suspicion into a measurable and then a generative object. That single idea is why he recurs here, across a paper-level method and a graph-level model.

His two load-bearing results in this vault:

• claim-simkin-roychowdhury-2002-identical-citation-misprints-are-copy-fingerprints-implying-about-20-percent-of-citers-read-the-original — repeated identical misprints as copy-fingerprints, implying only ~20% of citers read the original ("Read before you cite!", arXiv cond-mat/0212043).
• claim-simkin-roychowdhury-2005-random-copying-model-reproduces-preferential-attachment-and-sleeping-beauties — a random-copying model that reproduces preferential attachment and sleeping beauties ("A mathematical theory of citing", arXiv physics/0504094).

His copying premise also underwrites the vault's synthesis reading that a field's citation silence can be inherited rather than chosen: observation-copying-model-predicts-cross-field-citation-silence.

Both papers come from the same group: the 2002 one is an unrefereed author preprint and counts under the vault's single-source concentration cap, while the 2005 one was refereed and published (J. Am. Soc. Inf. Sci. Tech. 58(11):1661–1673, 2007), so the cap does not reach it. His figures (the ~20% readership estimate; the "majority copied" premise) are model-dependent estimates on physics-citation data, not independently corroborated in the vault.

References

• claim-simkin-roychowdhury-2002-identical-citation-misprints-are-copy-fingerprints-implying-about-20-percent-of-citers-read-the-original · claim-simkin-roychowdhury-2005-random-copying-model-reproduces-preferential-attachment-and-sleeping-beauties
• observation-copying-model-predicts-cross-field-citation-silence
• Related: entity-matthew-effect · claim-xu-2026-ghostcite-finds-citation-error-propagation-between-published-papers · claim-ansari-2026-contamination-inheritance-citation-error-propagates-across-models
• Captures: 2026-09-24-bipartite-two-things-this-vault-knows-in-different-kwakernaak-ansari, 2026-09-24-hop-copied-citations-make-zero-lineage-a-diffusion-prediction

Updates

• 2026-10-18: A different Simkin & Roychowdhury paper than the one that first cited Kimura and Crow — "Re-inventing Willis" (arXiv physics/0601192, 2006, unrefereed) — independently restates and re-solves the Kimura–Crow 1964 allele-distribution problem from scratch, and checks the result against Sewall Wright's 1931 formula. This is the first vault note resting on physics/0601192 and the strongest evidence yet that his 2005 citation of the 1964 result reflects genuine engagement with its mathematics, not a loose name-drop. (claim-simkin-roychowdhury-2006-re-inventing-willis-independently-rederives-kimura-crow-1964-checks-against-wright-1931)
• 2026-10-19 (propagation-repair): The 2026-10-18 entry above was corrected, following the 2026-10-19 scheduled cross-model audit of that claim-note. Was: "Re-inventing Willis" dated to 2006 and graded an unrefereed preprint, with the single-source concentration cap therefore in view. Now: the text carrying the re-derivation is the arXiv v3 of 17 Feb 2011, published as Physics Reports 502 (2011) 1–35 (doi:10.1016/j.physrep.2010.12.004) — a refereed review, which the cap does not reach, exactly as corrected on 2026-10-11 for the 2005 preprint / 2007 JASIST paper. The 25 Jan 2006 v1 is a 12-page text with no "Distribution of genes" section and no Kimura-and-Crow reference at all, so the re-derivation cannot be dated to 2006. Also: his paper's prose says Kimura and Crow built on "the 1930 work of Wright" while its reference [72] is Wright's 1931 Genetics paper. The re-derivation itself, and what it shows about his engagement with the 1964 mathematics, are unaffected.
• 2026-10-04: A bridge comparison against Alemohammad et al.'s 2026 recursive citation-dilution benchmark names his 2005 model's compounding, history-dependent feedback as the structural opposite of a mechanism that reaches the same concentration curve without one — the first time the vault has set his model's "copying needs history" premise explicitly against a mechanism that needs none. (observation-alemohammad-2026-simkin-2005-cosine-084-pairing-is-analytical-contrast)
• 2026-10-10: His 2005 paper names its own ancestor — it credits Kimura and Crow's 1964 neutral-allele model, jointly with Ewens (1964), as the prior derivation (by a different method) of its citation-count formula, locating the copying model in neutral-drift theory — and in the same four-sentence passage traces that theory forward into culture itself, naming Cavalli-Sforza & Feldman (1981) and then baby names (Hahn & Bentley, 2003) and dog breeds (Herzog, Bentley & Hahn, 2004). (claim-simkin-roychowdhury-credit-kimura-crow-1964-neutral-allele-model-as-prior-derivation, observation-kimura-crow-1964-is-shared-named-ancestor-of-citation-copying-and-cultural-drift-models)
• 2026-10-11 (propagation-repair): The 2026-10-10 entry above and the body's source-tier paragraph were corrected in place, following the 2026-10-11 cross-model audit of claim-simkin-roychowdhury-credit-kimura-crow-1964-neutral-allele-model-as-prior-derivation. Was: the 2005 paper credits Kimura and Crow alone as the prior derivation, and both of his papers here are unrefereed author preprints counting as one source under the single-source concentration cap. Now: the credit is joint — "by Kimura and Crow (1964) and by Ewens (1964)" — and the same passage names its own cultural-evolution descendants, so the genetics→baby-names leg is printed in his paper rather than assembled around it; and the 2005 paper is the refereed JASIST text (58(11):1661–1673, 2007; arxiv.org/pdf/physics/0504094 serves the post-refereeing v3), which the cap does not reach. The copying premise and the ~20% readership figure are unaffected.
• 2026-10-16: A targeted search for whether his 2005 copying mechanism specifically — not citation-count inflation generally — explains the training-corpus skew behind GPT-4's citation-popularity bias found no source that tests or even proposes the splice. His 2005 paper predates LLM citation behavior and makes no claim about machine training; Algaba et al.'s GPT-4 paper proposes training-data frequency as a bare fact about the corpus without engaging his or any copying-based account of why that frequency distribution looks the way it does. Routed as an open question rather than forced closed. (question-does-citation-copying-explain-training-corpus-skew-behind-llm-citation-bias)
• 2026-10-18: A second, independent search session one day later reconfirms the 2026-10-16 finding rather than extending it: his 2005 paper is explicitly a model of human citer behavior — it predates LLM-based citation generation by roughly fifteen years and makes no claim about machine training corpora — and two more papers newly surveyed in this sub-literature (Niimi 2025, Liu et al. 2026) still neither cite nor test his copying mechanism. The gap is corroborated, not new; still open.