Séminaire Lotharingien de Combinatoire, 84B.5 (2020), 12 pp.
A Characteristic Map for the Symmetric Space of Symplectic Forms over a Finite Field
The characteristic map for the symmetric group is an isomorphism
relating the representation theory of the symmetric group to symmetric
functions. An analogous isomorphism is constructed for the symmetric
space of symplectic forms over a finite field, with the spherical
functions being sent to Macdonald polynomials with parameters
(q,q2). An analogue of parabolic induction is interpreted as a
certain multiplication of symmetric functions. Applications are given
to Schur-positivity of skew Macdonald polynomials with parameters
Received: November 20, 2019.
Accepted: February 20, 2020.
Final version: April 30, 2020.
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