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arXiv 2201.11128hep-th
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时空对称性Noether定理的改进

An improved Noether's theorem for spacetime symmetries

Ioanna Kourkoulou, Alberto Nicolis, Guanhao Sun

摘要:

我们利用诺特定理中隐藏的一个模糊性,系统地推导出相对论性场论的应力-能量张量的改进项,这些改进项与平移之外的时空对称性有关。我们明确地计算了洛伦兹不变性、标度不变性和完全共形不变性的情形。主要思想是直接在平移诺特定理中使用这样一个事实,即这些额外的对称性可以被认为是适当调制的平移。与更标准的改进项推导相比,我们的(1)将所有不同的情况统一在一个框架中,(2)不涉及猜测,(3)产生所需的代数性质(对称性和/或无痕性)的应力-能量张量离壳,和(4)统一的平移诺特定理与那些额外的时空对称性,同时产生改进的应力-能量张量和附加的Noether电流。

英文摘要:

We exploit an ambiguity somewhat hidden in Noether's theorem to derive systematically, for relativistic field theories, the stress-energy tensor's improvement terms that are associated with additional spacetime symmetries beyond translations. We work out explicitly the cases of Lorentz invariance, scale invariance, and full conformal invariance. The main idea is to use, directly in the translation Noether theorem, the fact that these additional symmetries can be thought of as suitably modulated translations. Compared to more standard derivations of the improvement terms, ours (1) unifies all different cases in a single framework, (2) involves no guesswork, (3) yields the desired algebraic properties (symmetry and/or tracelessness) of the stress-energy tensor off-shell, and (4) unifies the translation Noether theorem with those of the additional spacetime symmetries, yielding at the same time both the improved stress-energy tensor and the additional Noether currents.

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