arXiv:2509.00898v2

The distribution of intersections in SL(3,Z)\SL(3,R)\mathrm{SL}(3, \mathbb{Z}) \backslash \mathrm{SL}(3, \mathbb{R}) and lattices related to roots of cubic congruences

Matthew Welsh

math.NTmath.DS11K3137D4037A44

Abstract

In this note we study the distribution of the intersections between certain translates of closed orbits of the positive diagonal subgroup in SL(3,Z)\SL(3,R)\mathrm{SL}(3, \mathbb{Z}) \backslash \mathrm{SL}(3, \mathbb{R}) with a maximal parabolic subgroup. These intersections are closely connected to roots of congruences for certain monic, irreducible cubic polynomials F(X)Z[X]F(X) \in \mathbb{Z}[X]. The the main result is that the intersections, considered as a sequences in the diagonal subgroup and the parabolic subgroup, are jointly equidistributed. This implies that certain affine lattices determined by pairs of roots of the cubic congruences are jointly equidistributed with corresponding ideals in the associated ring of integers. We note that the techniques here roughly parallel those which has been developed to study the multidimensional Farey sequence, and one hopes that techniques to study roots of congruences will continue to develop.

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Audited against arXiv v2

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Generated August 18, 2026
01Statements2 reported findingsCorrect

The parametrization of the relevant closed-orbit intersections by ideal data and roots of cubic congruences, and their joint equidistribution in the torus and affine-lattice factors, are correct under the maximal-order and total-reality assumptions.

Theorems 1.1–1.2Correct

Cubic congruence roots and orbit intersections are matched and equidistributed

Pages 5–6 and Sections 2–3 · arXiv:2509.00898v2

Hermite-normal-form bases of integral ideals give the congruences and coprimality conditions in Theorem 1.1, while multiplication by totally positive units gives precisely the quotient by the closed AA-orbit. The expanding-horosphere theorem applies after the LU decomposition outside a set of measure O(ε)O(\varepsilon). Cusp truncation and the lattice-point estimates make the discarded mass negligible before the continuous-test-function limit, yielding the joint Haar distribution.

Full paper, version 2
Theorem 1.2 and Corollary 3.4Correct

Congruence-root data and homogeneous-space position jointly equidistribute

Pages 8–9 and Section 3 · arXiv:2509.00898v2

The algebraic parametrization identifies each admissible cubic congruence root with the stated intersection orbit, including its lattice basis. The mixing theorem then applies to the thickened orbit pieces and yields the product limiting measure after cusp contributions are shown negligible.

02Proofs2 reported findingsCorrect

The ideal-basis correspondence, thickening, cusp control, and counting arguments are correct and complete.

Sections 2–3Correct and complete

The arithmetic and homogeneous-space normalizations agree

Pages 6–15 · Sections 2–3 · arXiv:2509.00898v2

The determinant and norm rescalings place all matrices in SL(3,R)\mathrm{SL}(3,\mathbb R), the unit stabilizer is exactly the narrow unit group, and the congruence parameter λ\lambda is unique modulo the stated product. In the equidistribution step, boundary length and cusp height estimates are uniform enough to take the limits in the announced order.

Section 3Correct and complete

Thickening, mixing, and cusp removal establish both equidistribution limits

Pages 15–25 · arXiv:2509.00898v2

Smooth thickening replaces the lower-dimensional intersections by testable neighborhoods with a controlled normalization. Mixing gives the main term uniformly on compacta, nondivergence bounds the omitted cusp portion, and approximation extends the result from smooth compactly supported tests to the bounded continuous class stated.

03Novelty0 reported findingsNo non-novelty findings

No non-novelty findings.

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Paper
arXiv:2509.00898v2
Authors listed
Matthew Welsh
Audit date
August 18, 2026
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