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arXiv 1502.03765hep-thmath-phmath.MP
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关于Moyal空间中的能量动量张量

On the energy-momentum tensor in Moyal space

Herbert Balasin, Daniel N. Blaschke, Francois Gieres, Manfred Schweda

摘要:

研究了非对易(Moyal)空间中与物质耦合的规范场的能量动量张量的性质。一般来说,非对易性会影响张量通常的守恒定律及其变换性质(规范协方差而不是规范不变性)。众所周知,能量动量张量守恒可以通过涉及另一种星积的重新定义来实现。此外,对于纯规范理论,总是可以通过威尔逊线定义规范不变的能量-动量张量。我们表明,后两个程序是相互不兼容的,如果耦合的规范场的物质领域(标量或费米子)被认为是:规范不变张量(通过威尔逊线构造)不允许重新定义,以确保其守恒,反之亦然,另一个星产品的引入不允许规范不变性的威尔逊线。

英文摘要:

We study the properties of the energy-momentum tensor of gauge fields coupled to matter in non-commutative (Moyal) space. In general, the non-commutativity affects the usual conservation law of the tensor as well as its transformation properties (gauge covariance instead of gauge invariance). It is known that the conservation of the energy-momentum tensor can be achieved by a redefinition involving another star-product. Furthermore, for a pure gauge theory it is always possible to define a gauge invariant energy-momentum tensor by means of a Wilson line. We show that the latter two procedures are incompatible with each other if couplings of gauge fields to matter fields (scalars or fermions) are considered: The gauge invariant tensor (constructed via Wilson line) does not allow for a redefinition assuring its conservation, and vice-versa the introduction of another star-product does not allow for gauge invariance by means of a Wilson line.

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