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arXiv 1709.04788math-phmath.ATmath.MP
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离散场论:对称性与守恒定律

Discrete field theory: symmetries and conservation laws

Mikhail Skopenkov

AI总结:

提出从拉格朗日量构造经典场论离散化的算法,证明新离散Noether定理与能量守恒定理,并构造守恒的离散能量-动量张量,为格点电动力学等理论提供精确守恒定律。

摘要:

我们提出了一种从拉格朗日量构造经典场论离散化的通用算法。我们证明了一个将对称性与守恒定律联系起来的新离散Noether定理,以及一个不基于任何对称性的能量守恒定理。这为多个理论提供了精确的守恒定律,例如格点电动力学和规范理论。特别地,我们构造了一个守恒的离散能量-动量张量,对于自由场它至少能近似连续情形。该理论用上边缘和上链积等拓扑术语表述。

英文摘要:

We present a general algorithm constructing a discretization of a classical field theory from a Lagrangian. We prove a new discrete Noether theorem relating symmetries to conservation laws and an energy conservation theorem not based on any symmetry. This gives exact conservation laws for several theories, e.g., lattice electrodynamics and gauge theory. In particular, we construct a conserved discrete energy-momentum tensor, approximating the continuum one at least for free fields. The theory is stated in topological terms, such as coboundary and products of cochains.

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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