Group actions, symplectic and contact geometry, and applications

群作用、辛几何和接触几何以及应用

• 批准号: RGPIN-2018-05771
• 负责人: Karshon, Yael
• 金额: $ 2.04万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=655151
• 关键词: Group; actions; symplectic; contact; geometry

***The central theme of my research program is using symmetries to learn about geometry, with a focus on symplectic and contact geometry.******Symplectic geometry has its roots in classical mechanics. It is the mathematical structure that underlies the equations of motion of celestial bodies, spinning tops, and mechanical linkages. Symplectic spaces are even dimensional; contact geometry is a related odd dimensional structure that comes up, for example, in geometric quantization -- a geometric procedure for passing from a classical mechanical system to a quantum mechanical system.******The field of symplectic geometry has gone through spectacular progress in recent decades, and deep connections have emerged with other fields of mathematics as well as with theoretical physics. Progress in the related field of contact geometry, specifically in dimensions greater than three, has been particularly dramatic in the last 5--10 years.******A "baby example" of a symplectic space with symmetry is the two dimensional sphere with its rotational symmetry. A higher dimensional example is the complex projective plane; symplectically, it can be viewed as a four dimensional ball with a two dimensional sphere sewed along its edge. Examples of contact spaces include odd dimensional spheres, real projective spaces, and more general so-called lens spaces. The full symmetry group of a symplectic or contact space is always infinite dimensional, but one can often find inside it a compact finite dimensional subgroup (which can be thought of as rotations in multiple dimensions). My research program involves the study of symplectic and contact spaces through such finite dimensional symmetries.******The proposal covers applications to geometric mechanics of multi-body systems (which model robot manipulators), applications to geometric quantization, rigidity phenomena in symplectic and contact geometry, and new classification schemes.**

*我的研究计划的中心主题是使用对称学来学习几何，重点是辛几何和接触几何。辛几何源于经典力学。正是这种数学结构构成了天体、自转顶端和机械连杆的运动方程。辛空间是偶数维的；接触几何是一种相关的奇数维结构，例如，在几何量子化中出现--从经典机械系统到量子力学系统的几何过程。*辛几何领域在最近几十年里取得了惊人的进步，与其他数学领域和理论物理也出现了深刻的联系。在过去的5-10年里，接触几何的相关领域，特别是在维度大于3的领域，取得了特别显著的进展。*具有对称性的辛空间的一个“婴儿例子”是具有旋转对称性的二维球体。一个更高维的例子是复射影平面；从辛的角度看，它可以看作一个四维球，它的边缘缝着一个二维球。接触空间的例子包括奇数维球面、实射影空间和更一般的所谓透镜空间。辛空间或接触空间的全对称群总是无限维的，但人们经常可以在它里面发现一个紧致的有限维子群(可以被认为是多维旋转)。我的研究计划涉及通过这种有限维对称来研究辛空间和接触空间。*该建议涵盖了多体系统几何力学的应用(机器人机械手建模)，几何量子化的应用，辛几何和接触几何中的刚性现象，以及新的分类方案。