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arXiv 2008.11260hep-thmath-phmath.MP
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流体动力学和西格玛模型中的拓扑项和反同态反常

Topological Terms and Diffeomorphism Anomalies in Fluid Dynamics and Sigma Models

V. P. Nair

摘要:

如果在作用量中加入某些拓扑项,则目标空间的双态对称性的要求会导致西格玛模型和流体动力学的能量-动量张量的反常双态子。我们分析几个例子。一个特定的拓扑项示出,导致已知的有效流体力学的密集收集的旋涡,即涡流体理论在2+1维。在3+1维类似的涡流流体的可能性,以及流体的结和链接,与可能的扩展的代数也进行了讨论。

英文摘要:

The requirement of diffeomorphism symmetry for the target space can lead to anomalous commutators for the energy-momentum tensor for sigma models and for fluid dynamics, if certain topological terms are added to the action. We analyze several examples . A particular topological term is shown to lead to the known effective hydrodynamics of a dense collection of vortices, i.e. the vortex fluid theory in 2+1 dimensions. The possibility of a similar vortex fluid in 3+1 dimensions, as well as a fluid of knots and links, with possible extended diffeomorphism algebras is also discussed.

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