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arXiv math-ph/0511080math-phmath.MP
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李群胚上的离散拉格朗日场论

Discrete Lagrangian field theories on Lie groupoids

Joris Vankerschaver, Frans Cantrijn

摘要:

我们提出了一个离散经典场论的几何框架,其中场被建模为定义在基空间中的离散网格上的“态射”,并取李群胚中的值。我们描述了基本的几何设置,并从变分原理推导出场方程。我们还证明了这些方程的解是Bridges和Marsden意义下的多辛解。这里采用的广群框架使我们不仅可以恢复一些以前已知的结果离散多辛场论,但也得到了一些新的结果,最显着的概念离散李泊松方程和离散减少。在最后一节中,我们建立了与离散微分几何和格点上的规范理论的联系。

英文摘要:

We present a geometric framework for discrete classical field theories, where fields are modeled as "morphisms" defined on a discrete grid in the base space, and take values in a Lie groupoid. We describe the basic geometric setup and derive the field equations from a variational principle. We also show that the solutions of these equations are multisymplectic in the sense of Bridges and Marsden. The groupoid framework employed here allows us to recover not only some previously known results on discrete multisymplectic field theories, but also to derive a number of new results, most notably a notion of discrete Lie-Poisson equations and discrete reduction. In a final section, we establish the connection with discrete differential geometry and gauge theories on a lattice.

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。

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