Simple smooth representations of Lie algebras

李代数的简单平滑表示

• 批准号: RGPIN-2020-04774
• 负责人: Zhao, Kaiming
• 金额: $ 1.53万
• 依托单位: Wilfrid Laurier University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=740171
• 关键词: Simple; smooth; representations; Lie; algebras

Lie algebra theory has become more and more widely used in many branches of mathematics and physics, including associative algebra, algebraic geometry, geometric representation, vertex operator algebra, partial differential equations, algebraic combinatorics, string theory, conformal field theory, soliton theory. Besides being useful in many subjects, Lie algebra theory is inherently attractive, combining a great depth and a satisfying degree of completeness in its basic theory. There are still many interesting problems for the theory and its applications. For example, one important problem is how to classify different classes of irreducible representations for various Lie algebras. Representation theory for Lie algebras is far from being well developed. One reason is that it is generally considered impossible to classify all irreducible modules over any nontrivial Lie algebras as pointed out by Dixmier. So far, only the 2-dimensional non-abelian Lie algebra, the 3-dimensional simple Lie algebra, the 3-dimensional Heisenberg algebra and some of their deformations have such classifications. The main objective of my research is to study some irreducible representations for important Lie algebras in physics, such as affine Kac-Moody algebras, the Virasoro algebra, the twisted Heisenberg-Virasoro algebra, and other Lie algebras with useful structure and applications (for example, super-elliptic Lie algebras and Witt algebras).   Another objective of my program is to apply Lie algebra theory to the study of isomorphisms and automorphisms of algebraic curves in algebraic geometry, and to the study of automorphisms of polynomial rings, Aut(C[x1, x2, ..., xn]), which is a long standing problem for n>2 in commutative algebra. More precisely, in the next five years, I plan to carry out the following investigations. 1. Classify irreducible smooth representations for affine Kac-Moody algebras, in particular, irreducible restricted representations for affine Kac-Moody algebras; 2. Classify irreducible weight representations with finite dimensional weight spaces for Witt algebras W+n , and determine higher height (>1) simple smooth modules over W+n ; 3. Construct new simple weight or non-weight sln+1-modules and characterize some classes of known simple sln+1-modules; 4. Use simple representations of Heisenberg algebras to construct new simple weight or non-weight modules over the finite dimensional Lie algebras of type Cn and G2; 5. Develop Krichever-Novikov algebra theory of higher genus to study isomorphisms and automorphisms of algebraic curves in algebraic geometry. Solutions to these problems will benefit studies in both physics and mathematics.

李代数理论在数学和物理的许多分支中得到了越来越广泛的应用，包括结合代数、代数几何、几何表示、顶点算子代数、偏微分方程、代数组合学、弦理论、共形场论、孤子理论等。除了在许多学科中有用之外，李代数理论在其基础理论中结合了很大的深度和令人满意的完整程度，具有内在的吸引力。但是，这一理论及其应用仍然存在许多值得关注的问题。例如，一个重要的问题是如何对各种李代数的不可约表示进行分类。李代数的表示理论还远没有得到很好的发展。一个原因是，正如Dixmier指出的那样，通常认为不可能对任何非平凡李代数上的所有不可约模进行分类。到目前为止，只有二维非交换李代数、三维单李代数、三维Heisenberg代数以及它们的一些变形有这样的分类。主要研究物理学中重要李代数的不可约表示，如仿射Kac-Moody代数，Virasoro代数，扭曲Heisenberg-Virasoro代数，以及其他具有有用结构和应用的李代数（如超椭圆李代数和Witt代数）。 我的程序的另一个目标是应用李代数理论研究代数几何中代数曲线的同构和自同构，并研究多项式环Aut（C[x1，x2，...，xn]），这是交换代数中n>2的一个长期存在的问题。更准确地说，在未来五年，我计划开展以下调查。1.分类仿射Kac-Moody代数的不可约光滑表示，特别是仿射Kac-Moody代数的不可约限制表示; 2.对Witt代数W+n在有限维权空间上的不可约权表示进行分类，并确定W+n上的高（>1）单光滑模; 3.构造了新的单权或无权sln+1-模，并刻画了几类已知的单sln+1-模; 4.利用Heisenberg代数的简单表示构造Cn型和G2型有限维李代数上的新的单权或非权模; 5.发展了高亏格的Krichever-Novikov代数理论，研究了代数几何中代数曲线的同构和自同构。这些问题的解决将有利于物理学和数学的研究。