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arXiv math-ph/0111040math-phmath.DGmath.MPmath.SG
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多辛动量映射的框架丛推广

A Frame Bundle Generalization of Multisymplectic Momentum Mappings

J. K. Lawson

摘要:

本文给出了协变哈密顿场论的广义动量映射。新的动量映射产生于辛几何到$L_VY$的推广,$L_VY$是场配置束$Y$上的垂直自适应线性标架束。具体地说,广义场动量观测量是从$Y$的自同构生成的垂直自适应框架丛上的向量值动量映射。$L_VY$上的广义辛几何是多相空间$Z$上的多辛几何的覆盖理论,由此得出$Z$上的场动量观测量是$L_VY$上的场动量观测量的推广。此外,在$L_VY$上的动量观测产生沿$L_VY$中流动的守恒量。对于场的平移和正交对称性以及力学中的重新参数化对称性,动量是守恒的;对于时间演化力学中的角动量,我们给出了旋转动力学的平行轴定理;在狭义相对论中,我们给出了角动量在助推下的变换。

英文摘要:

This paper presents generalized momentum mappings for covariant Hamiltonian field theories. The new momentum mappings arise from a generalization of symplectic geometry to $L_VY$, the bundle of vertically adapted linear frames over the bundle of field configurations $Y$. Specifically, the generalized field momentum observables are vector-valued momentum mappings on the vertically adapted frame bundle generated from automorphisms of $Y$. The generalized symplectic geometry on $L_VY$ is a covering theory for multisymplectic geometry on the multiphase space $Z$, and it follows that the field momentum observables on $Z$ are generalized by those on $L_VY$. Furthermore, momentum observables on $L_VY$ produce conserved quantities along flows in $L_VY$. For translational and orthogonal symmetries of fields and reparametrization symmetry in mechanics, momentum is conserved, and for angular momentum in time-evolution mechanics we produce a version of the parallel axis theorem of rotational dynamics, and in special relativity, we produce the transformation of angular momentum under boosts.

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