| HAL : hal-00366245, version 1 |
| arXiv : 0903.1187 |
| Fiche détaillée | Récupérer au format |
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| Geometric Invariant Theory and Generalized Eigenvalue Problem II |
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| Nicolas Ressayre 1 |
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| (06/03/2009) |
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| Let $G$ be a connected reductive subgroup of a complex connected reductive group $\hat{G}$. Fix maximal tori and Borel subgroups of $G$ and $\hat{G}$. Consider the cone $LR^\circ(\hat{G},G)$ generated by the pairs $(\nu,\hat{\nu})$ of strictly dominant characters such that $V_\nu$ is a submodule of $V_{\hat\nu}$. The main result of this article is a bijective parametrisation of the faces of $LR^\circ(\hat G,G)$. We also explain when such a face is contained in another one. In way, we obtain results about the faces of the Dolgachev-Hu's $G$-ample cone. We also apply our results to reprove known results about the moment polytopes. |
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| 1 : | Institut de Mathématiques et de Modélisation de Montpellier (I3M) |
| CNRS : UMR5149 – Université Montpellier II - Sciences et Techniques du Languedoc | |
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| Domaine | : | Mathématiques/Géométrie algébrique |
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| Horn problem |
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| Liste des fichiers attachés à ce document : | ||||||||||
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| hal-00366245, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00366245 | |
| oai:hal.archives-ouvertes.fr:hal-00366245 | |
| Contributeur : Nicolas Ressayre | |
| Soumis le : Vendredi 6 Mars 2009, 11:56:31 | |
| Dernière modification le : Vendredi 6 Mars 2009, 11:59:28 | |