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Push forwards of smooth measures on the unitary group in odd characteristic under the Chevalley map are almost bounded

  • Avraham Aizenbud
  • Nir Avni
  • Dmitry Gourevitch
  • David Kazhdan
  • Eitan Sayag
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Abstract

In this paper we study analytic properties of the Chevalley map p:u → c where u is the Lie algebra of a unitary group over a local field of odd characteristics. This map essentially sends a matrix to its characteristic polynomial. Our main result is that smooth compactly supported measures on u are pushed by the Chevalley map to measures on c with density functions in Lq(c) for all q < ∞. We also provide similar results for the Chevalley map attached to the unitary group. An important consequence is an odd characteristic analogue to results of Harish-Chandra stating the local integrability of the orbital integrals on the unitary group and its Lie algebra. Further possible applications to local integrability of characters of admissible representations of unitary groups over local fields of odd characteristic are also discussed.

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Cite

BibTeXRIS
BibTeX
@misc{aizenbud2026push,
  title = {{Push forwards of smooth measures on the unitary group in odd characteristic under the Chevalley map are almost bounded}},
  author = {Avraham Aizenbud and Nir Avni and Dmitry Gourevitch and David Kazhdan and Eitan Sayag},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.41630},
  eprint = {2610.41630},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.41630},
}
RIS
TY  - UNPB
TI  - Push forwards of smooth measures on the unitary group in odd characteristic under the Chevalley map are almost bounded
AU  - Avraham Aizenbud
AU  - Nir Avni
AU  - Dmitry Gourevitch
AU  - David Kazhdan
AU  - Eitan Sayag
PY  - 2026
DA  - 2026/10/30
PB  - arXiv
DO  - 10.48550/arxiv.2610.41630
UR  - https://arxiv.org/abs/2610.41630
AB  - In this paper we study analytic properties of the Chevalley map p:u → c where u is the Lie algebra of a unitary group over a local field of odd characteristics. This map essentially sends a matrix to its characteristic polynomial. Our main result is that smooth compactly supported measures on u are pushed by the Chevalley map to measures on c with density functions in L^q(c) for all q < ∞. We also provide similar results for the Chevalley map attached to the unitary group. An important consequence is an odd characteristic analogue to results of Harish-Chandra stating the local integrability of the orbital integrals on the unitary group and its Lie algebra. Further possible applications to local integrability of characters of admissible representations of unitary groups over local fields of odd characteristic are also discussed.
ER  -