Similarity classes of integral p-adic matrices and representation zeta functions of groups of type A2

Nir Avni, Benjamin Klopsch, Uri Onn, Christopher Voll

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We compute explicitly Dirichlet generating functions enumerating finite-dimensional irreducible complex representations of various p-adic analytic and adèlic profinite groups of type A2. This has consequences for the representation zeta functions of arithmetic groups τ H(k), where k is a number field and H is a k-form of SL3: assuming that τ possesses the strong congruence subgroup property, we obtain precise, uniform estimates for the representation growth of τ. Our results are based on explicit, uniform formulae for the representation zeta functions of the p-adic analytic groups SL3(o) and SU3(o), where o is a compact discrete valuation ring of characteristic 0. These formulae build on our classification of similarity classes of integral p-adic 3 × 3 matrices in gl3(o) and gu3(o), where o is a compact discrete valuation ring of arbitrary characteristic. Organising the similarity classes by invariants which we call their shadows allows us to combine the Kirillov orbit method with Clifford theory to obtain explicit formulae for representation zeta functions. In a different direction we introduce and compute certain similarity class zeta functions. Our methods also yield formulae for representation zeta functions of various finite subquotients of groups of the form SL3(o), SU3(o), GL3(o), and GU3(o), arising from the respective congruence filtrations; these formulae are valid in case that the characteristic of o is either 0 or sufficiently large. Analysis of some of these formulae leads us to observe p-adic analogues of eEnnola dualityf.

Original languageEnglish (US)
Pages (from-to)267-350
Number of pages84
JournalProceedings of the London Mathematical Society
Volume112
Issue number2
DOIs
StatePublished - Feb 1 2016

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P-adic
Riemann zeta function
Valuation Ring
Clifford Theory
Arithmetic Groups
Profinite Groups
P-adic Groups
Congruence Subgroups
Analytic group
Uniform Estimates
Number field
Filtration
Dirichlet
Congruence
Generating Function
Explicit Formula
Orbit
Similarity
Class
Valid

ASJC Scopus subject areas

  • Mathematics(all)

Cite this

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abstract = "We compute explicitly Dirichlet generating functions enumerating finite-dimensional irreducible complex representations of various p-adic analytic and ad{\`e}lic profinite groups of type A2. This has consequences for the representation zeta functions of arithmetic groups τ H(k), where k is a number field and H is a k-form of SL3: assuming that τ possesses the strong congruence subgroup property, we obtain precise, uniform estimates for the representation growth of τ. Our results are based on explicit, uniform formulae for the representation zeta functions of the p-adic analytic groups SL3(o) and SU3(o), where o is a compact discrete valuation ring of characteristic 0. These formulae build on our classification of similarity classes of integral p-adic 3 × 3 matrices in gl3(o) and gu3(o), where o is a compact discrete valuation ring of arbitrary characteristic. Organising the similarity classes by invariants which we call their shadows allows us to combine the Kirillov orbit method with Clifford theory to obtain explicit formulae for representation zeta functions. In a different direction we introduce and compute certain similarity class zeta functions. Our methods also yield formulae for representation zeta functions of various finite subquotients of groups of the form SL3(o), SU3(o), GL3(o), and GU3(o), arising from the respective congruence filtrations; these formulae are valid in case that the characteristic of o is either 0 or sufficiently large. Analysis of some of these formulae leads us to observe p-adic analogues of eEnnola dualityf.",
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Similarity classes of integral p-adic matrices and representation zeta functions of groups of type A2. / Avni, Nir; Klopsch, Benjamin; Onn, Uri; Voll, Christopher.

In: Proceedings of the London Mathematical Society, Vol. 112, No. 2, 01.02.2016, p. 267-350.

Research output: Contribution to journalArticle

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