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  1. Home > Articles & Issues >
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  3. Evaluations of Hecke ...
Conference paper

Evaluations of Hecke algebra traces at Kazhdan-Lusztig basis elements

Sam Clearman (1), Matthew Hyatt (1), Brittany Shelton ORCID (1), Mark Skandera (1)
(1) Department of Mathematics
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Imported on
November 21, 2016
Published on
December 31, 2012
Last modified on
March 31, 2025
Volume
DMTCS Proceedings vol. AS, 25th International Conference on Formal Power Series and Algebraic Combinatorics (FPSAC 2013)
Proceedings
DOI
10.46298/dmtcs.2368
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https://about.hal.science/hal-authorisation-v1
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Evaluations of Hecke algebra traces at Kazhdan-Lusztig basis elements

Sam Clearman (1), Matthew Hyatt (1), Brittany Shelton ORCID (1), Mark Skandera (1)
(1) Department of Mathematics
Abstract
English
For irreducible characters $\{ \chi_q^{\lambda} | \lambda \vdash n\}$ and induced sign characters $\{\epsilon_q^{\lambda} | \lambda \vdash n\}$ of the Hecke algebra $H_n(q)$, and Kazhdan-Lusztig basis elements $C'_w(q)$ with $w$ avoiding the pattern 312, we combinatorially interpret the polynomials $\chi_q^{\lambda}(q^{\frac{\ell(w)}{2}} C'_w(q))$ and $\epsilon_q^{\lambda}(q^{\frac{\ell(w)}{2}} C'_w(q))$. This gives a new algebraic interpretation of $q$-chromatic symmetric functions of Shareshian and Wachs. We conjecture similar interpretations and generating functions corresponding to other $H_n(q)$-traces.
French
Pour les caractères irréductibles $\{ \chi_q^{\lambda} | \lambda \vdash n\}$ et les caractères induits du signe $\{\epsilon_q^{\lambda} | \lambda \vdash n\}$ du algèbre de Hecke, et les éléments $C'_w(q)$ du base Kazhdan-Lusztig avec $w$ qui évite le motif 312, nous interprétons les polynômes $\chi_q^{\lambda}(q^{\frac{\ell(w)}{2}} C'_w(q))$ et $\epsilon_q^{\lambda}(q^{\frac{\ell(w)}{2}} C'_w(q))$ de manière combinatoire. Cette donne une nouvelle interprétation aux fonctions symétriques $q$-chromatiques de Shareshian et Wachs. Nous conjecturons des interprétations semblables et des fonctions génératrices qui correspondent aux autres applications centrales de $H_n(q)$.
Keywords
  • [INFO.INFO-DM]Computer Science [cs]/Discrete Mathematics [cs.DM]
  • Hecke algebra
  • trace
  • Kazhdan-Lusztig basis
  • tableau
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