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Orbital integrals and normalizations of measures

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arxiv 2205.02391 v1 pith:5O7GDKYQ submitted 2022-05-05 math.NT math.RT

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keywords measuresintegralsmathfrakmeasureorbitalorbitsworkalgebra
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abstract

This note provides an informal introduction, with examples, to some technical aspects of the re-normalization of measures on orbital integrals used in the work of Langlands, Frenkel-Langlands-Ng\^o, and Altug on Beyond Endoscopy. In particular, we survey different relevant measures on algebraic tori and explain the connection with the Tamagawa numbers. We work out the example of $\mathrm{GL}_2$ in complete detail. The Appendix by Matthew Koster illustrates, for the Lie algebras $\mathfrak{sl}_2$ and $\mathfrak{so}_3$, the relation between the so-called geometric measure on the orbits and Kirillov's measure on co-adjoint orbits in the linear dual of the Lie algebra.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Stable orbital integrals for classical Lie algebras and smooth integral models

    math.NT 2024-11 conditional novelty 8.0 of 10

    A stratification and smoothening method gives exact stable orbital integral formulas for gl2, gl3, and u2, and new lower bounds for all n.

  2. Ideal class monoids of cubic orders

    math.NT 2026-07 accept novelty 7.0 of 10

    A closed Euler product formula for the genus set cardinality of Gorenstein cubic orders is derived via explicit local overorder classification.

  3. Global geometrization of local smooth integral models in the Hitchin fibration for $\mathrm{GL}_n$: The Bass case

    math.NT 2026-07 accept novelty 6.0 of 10

    The algebraic stratification of Hitchin fibers via local smoothening types is proven equivalent to the geometric stratification by partial normalizations for GL_n in the Bass case, yielding an explicit cohomology form...

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