arXivDaily arXiv每日学术速递 周一至周五更新
arXiv math/0506133math.AGmath.RT
收藏

本原向量锥的形变

Deformations of cones of primitive vectors

Sebastien Jansou

摘要:

对于复连通约化群G,我们对本原向量锥具有非平凡G-不变变形的单模进行了分类。我们将这种分类的简单约旦代数,并顺利(由于Akhiezer)的投射品种的轨道下的行动,一个连接的仿射代数群是一个因子和它的互补。我们的主要工具是Alexeev-Brion的不变希尔伯特方案;我们确定了它的第一个例子。我们还确定了本原向量的锥的无穷小变形(不一定是G-不变的);它们对大多数简单模来说是平凡的。

英文摘要:

For a complex connected reductive group G, we classify the simple modules whose cone of primitive vectors admits a nontrivial G-invariant deformation. We relate this classification to that of simple Jordan algebras, and to that (due to Akhiezer) of smooth projective varieties whose orbits under the action of a connected affine algebraic group are a divisor and its complementary. Our main tool is the invariant Hilbert scheme of Alexeev-Brion; we determine the first examples of it. We also determine the infinitesimal deformations (non necessarily G-invariant) of the cones of primitive vectors; they turn out to be trivial for most simple modules.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑