no. 3
Parabolic bundles, products of conjugacy classes, and Gromov-Witten invariants
Teleman, Constantin1; Woodward, Christopher2
1 University of Cambridge, DPMMS, CMS, Wilberforce Road, Cambridge CB3 0WB (Grande-Bretagne)
2 Rutgers University, Mathematics, Hill Center, 110 Frelinghuysen Road, Piscataway NJ 08854-8019 (USA)
Annales de l'Institut Fourier, Volume 53 (2003) no. 3, pp. 713-748.

The set of conjugacy classes appearing in a product of conjugacy classes in a compact, 1-connected Lie group K can be identified with a convex polytope in the Weyl alcove. In this paper we identify linear inequalities defining this polytope. Each inequality corresponds to a non-vanishing Gromov-Witten invariant for a generalized flag variety G/P, where G is the complexification of K and P is a maximal parabolic subgroup. This generalizes the results for SU(n) of Agnihotri and the second author and Belkale on the eigenvalues of a product of unitary matrices and quantum cohomology of Grassmannians.

L'ensemble des classes de conjugaison apparaissant dans un produit de classes de conjugaison d'un groupe de Lie 1-connexe compact peut être identifié avec un polytope convexe dans une chambre pour le groupe affine de Weyl. Nous démontrons que les inégalités linéaires définissant ce polytope correspondent aux invariants de Gromov- Witten pour les variétés de drapeaux généralisées. Ceci généralise les résultats de Agnihotri, du deuxième auteur et de Belkale sur les valeurs propres d'un produit de matrices unitaires et la cohomologie quantique des grassmanniennes.

DOI: 10.5802/aif.1957
Classification: 14L30, 14N35, 05E99
Keywords: conjugacy classes, parabolic bundles, quantum cohomology
Teleman, Constantin 1; Woodward, Christopher 2

1 University of Cambridge, DPMMS, CMS, Wilberforce Road, Cambridge CB3 0WB (Grande-Bretagne)
2 Rutgers University, Mathematics, Hill Center, 110 Frelinghuysen Road, Piscataway NJ 08854-8019 (USA) 
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Teleman, Constantin; Woodward, Christopher. Parabolic bundles, products of conjugacy classes, and Gromov-Witten invariants. Annales de l'Institut Fourier, Volume 53 (2003) no. 3, pp. 713-748. doi : 10.5802/aif.1957. https://aif.centre-mersenne.org/articles/10.5802/aif.1957/

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