Starting from an arbitrary cluster-tilting object in a 2-Calabi–Yau triangulated category over an algebraically closed field, as in the setting of Keller and Reiten, we define, for each object , a fraction using a formula proposed by Caldero and Keller. We show that the map taking to is a cluster character, i.e. that it satisfies a certain multiplication formula. We deduce that it induces a bijection, in the finite and the acyclic case, between the indecomposable rigid objects of the cluster category and the cluster variables, which confirms a conjecture of Caldero and Keller.
Etant donné un objet amas-basculant quelconque dans une catégorie triangulée 2-Calabi–Yau sur un corps algébriquement clos (comme dans le cadre de Keller et Reiten), il est possible de définir, pour chaque objet , une fraction rationnelle , en utilisant une formule proposée par Caldero et Keller. On montre, de plus, que l’application associant à est un caractère amassé ; c’est-à-dire qu’elle vérifie une certaine formule de multiplication. Cela permet de prouver qu’elle induit, dans les cas fini et acyclique, une bijection entre objets rigides indécomposables de la catégorie amassée et variables d’amas de l’algèbre amassée correspondante, confirmant ainsi une conjecture de Caldero et Keller.
Keywords: Calabi–Yau triangulated category, cluster algebra, cluster category, cluster-tilting object
Mot clés : catégorie triangulée 2-Calabi–Yau, algèbre amassée, catégorie amassée, objet amas-basculant
@article{AIF_2008__58_6_2221_0, author = {Palu, Yann}, title = {Cluster characters for {2-Calabi{\textendash}Yau} triangulated categories}, journal = {Annales de l'Institut Fourier}, pages = {2221--2248}, publisher = {Association des Annales de l{\textquoteright}institut Fourier}, volume = {58}, number = {6}, year = {2008}, doi = {10.5802/aif.2412}, zbl = {1154.16008}, mrnumber = {2473635}, language = {en}, url = {http://archive.numdam.org/articles/10.5802/aif.2412/} }
TY - JOUR AU - Palu, Yann TI - Cluster characters for 2-Calabi–Yau triangulated categories JO - Annales de l'Institut Fourier PY - 2008 SP - 2221 EP - 2248 VL - 58 IS - 6 PB - Association des Annales de l’institut Fourier UR - http://archive.numdam.org/articles/10.5802/aif.2412/ DO - 10.5802/aif.2412 LA - en ID - AIF_2008__58_6_2221_0 ER -
%0 Journal Article %A Palu, Yann %T Cluster characters for 2-Calabi–Yau triangulated categories %J Annales de l'Institut Fourier %D 2008 %P 2221-2248 %V 58 %N 6 %I Association des Annales de l’institut Fourier %U http://archive.numdam.org/articles/10.5802/aif.2412/ %R 10.5802/aif.2412 %G en %F AIF_2008__58_6_2221_0
Palu, Yann. Cluster characters for 2-Calabi–Yau triangulated categories. Annales de l'Institut Fourier, Volume 58 (2008) no. 6, pp. 2221-2248. doi : 10.5802/aif.2412. http://archive.numdam.org/articles/10.5802/aif.2412/
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