arXiv:2211.02122v2

A differential analogue of the wild automorphism conjecture

Jason Bell, Colin Ingalls, Rahim Moosa, Matthew Satriano

math.AGmath.LOmath.RA12H0503C9832M2513N1511J95

Abstract

A differential analogue of the conjecture of Reichstein, Rogalski, and Zhang in algebraic dynamics is here established: if XX is a projective variety over an algebraically closed field of characteristic zero which admits a global algebraic vector field v:XTXv:X\to TX such that (X,v)(X,v) has no proper invariant subvarieties then XX is an abelian variety. Vector fields on abelian varieties with this property are also examined. Some of the analysis works in the more general context of DD-varieties over differential fields: projective DD-varieties without proper DD-subvarieties are homogeneous. But the main theorem does not extend: an example of a DD-variety structure on the projective line without proper DD-subvarieties is given.

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Audited against arXiv v2

Not a correctness certificate. A “Correct” result may include yellow typos or minor formal corrections that do not affect substantive soundness. It means this audit found no unresolved substantive error under the stated criteria; it does not replace expert scrutiny or formal verification.

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Detailed mathematical audit

Generated August 18, 2026
01Statements3 reported findingsCorrect

The differential analogue of the wild-automorphism conjecture, its refinements for simple abelian varieties, and the example distinguishing wild vector fields from general DD-varieties are supported.

Theorem 1.1Correct

A projective variety with a wild vector field is abelian

Pages 1–6 · Theorem 1.1 and Sections 2–4 · arXiv:2211.02122v2

Wildness first forces the connected automorphism group to act transitively. The standard structure theorem then expresses the smooth projective homogeneous variety as Y×AY\times A, with AA abelian and YY a homogeneous space of a connected affine group. The vector field splits accordingly and H1(Y,OY)=0H^1(Y,\mathcal O_Y)=0. Proposition 3.1 then gives a global lift of the YY-component to an ample line bundle; a homogeneous eigenvector for the induced derivation on the section ring produces a nonempty proper invariant subvariety whenever dimY>0\dim Y>0. Wildness therefore forces YY to be a point.

Propositions 5.1 and 5.2Correct

Simple abelian varieties and rational first integrals

Pages 6–8 · Section 5 · arXiv:2211.02122v2

For a nonzero vector field on a simple abelian variety, Buium's trivialization sends any invariant subvariety to a constant subvariety after translation. If that subvariety were proper, its stabilizer would be positive-dimensional; simplicity would then force the stabilizer, and hence the subvariety, to be all of the abelian variety. For a general abelian variety, one implication follows from invariant level sets of a rational first integral, and the converse is the cited differential Dixmier–Moeglin equivalence for the isotrivial vector field.

Section 6Correct

A DD-variety counterexample outside the vector-field setting

Pages 7–8 · Section 6 · arXiv:2211.02122v2

The Riccati equation attached to the Airy equation defines the claimed DD-structure on P1\mathbb P^1. Algebraic independence of the two Airy solutions rules out a proper invariant algebraic subset in the relevant differential field, while the underlying projective line is not an abelian variety. This shows why the vector-field hypothesis in the main theorem is essential.

02Proofs1 reported findingCorrect

The proof chains are correct and complete. The invoked structure results are used with their required smoothness, projectivity, and characteristic-zero hypotheses, and the invariant-subvariety arguments cover the possible homogeneous factors.

Sections 2–6Correct and complete

Homogeneous-space reduction and differential-algebraic examples

Pages 2–9 · arXiv:2211.02122v2

The absence of invariant subvarieties makes every closed Aut0(X)\operatorname{Aut}_0(X)-invariant subset trivial, which yields transitivity; the Y×AY\times A decomposition is then applied to the resulting smooth projective homogeneous variety. On a positive-dimensional YY, the lifted derivation and homogeneous-eigenvector construction gives a genuinely nonempty proper invariant subvariety. The final propositions use simplicity only in Proposition 5.1 and explicitly exhibit why the conclusion does not extend to arbitrary DD-varieties.

03Novelty0 reported findingsNo non-novelty findings

No non-novelty findings.

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Paper
arXiv:2211.02122v2
Authors listed
Jason Bell, Colin Ingalls, Rahim Moosa, Matthew Satriano
Audit date
August 18, 2026
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