Comptes Rendus
Geometry/Algebra
The equivariant Riemann–Roch theorem and the graded Todd class
[Le théorème de Riemann–Roch équivariant et la classe de Todd graduée]
Comptes Rendus. Mathématique, Volume 355 (2017) no. 5, pp. 563-570.

Soit G un tore d'algèbre de Lie g agissant de manière hamiltonienne sur une variété M. Soit L un fibré de Kostant tel que l'application moment associée soit propre. Soit Λg le réseau des poids de G. On considère un paramètre k1 et la multiplicité m(λ,k) de la représentation quantifiée RRG(M,Lk). On définit la distribution Θ(k),f=λΛm(λ,k)f(λ/k) pour f une fonction test sur g. La distribution Θ(k) admet un développement asymptotique Θ(k),fkdimM/2n=0knDHn,f où les distributions DHn sont des distributions associées aux composantes homogènes de la classe de Todd équivariante de M. Lorsque M est compacte et f polynomiale, cette série est finie et exacte.

Let G be a torus with Lie algebra g and let M be a G-Hamiltonian manifold with Kostant line bundle L and proper moment map. Let Λg be the weight lattice of G. We consider a parameter k1 and the multiplicity m(λ,k) of the quantized representation RRG(M,Lk). Define Θ(k),f=λΛm(λ,k)f(λ/k) for f a test function on g. We prove that the distribution Θ(k) has an asymptotic development Θ(k),fkdimM/2n=0knDHn,f where the distributions DHn are the twisted Duistermaat–Heckman distributions associated with the graded equivariant Todd class of M. When M is compact, and f polynomial, the asymptotic series is finite and exact.

Reçu le :
Accepté le :
Publié le :
DOI : 10.1016/j.crma.2017.01.009
Michèle Vergne 1

1 Université Denis-Diderot–Paris-7, Institut de Mathématiques de Jussieu, C.P. 7012, 4 place Jussieu, Boite Courrier 247, 75252 Paris Cedex 05, France
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     title = {The equivariant {Riemann{\textendash}Roch} theorem and the graded {Todd} class},
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     doi = {10.1016/j.crma.2017.01.009},
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Michèle Vergne. The equivariant Riemann–Roch theorem and the graded Todd class. Comptes Rendus. Mathématique, Volume 355 (2017) no. 5, pp. 563-570. doi : 10.1016/j.crma.2017.01.009. https://comptes-rendus.academie-sciences.fr/mathematique/articles/10.1016/j.crma.2017.01.009/

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