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arXiv 1502.06544hep-thmath-phmath.MPmath.QA
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闭星积的非对易$R^d$

Noncommutative $R^d$ via closed star product

V. G. Kupriyanov, P. Vitale

摘要:

考虑李代数型$R^d$上的线性星积.首先,我们推导出相应的李代数生成元的多重微分表示的封闭公式。利用这种表示,我们定义了Weyl星积的对偶李代数。然后我们构造了一个规范算子,它将Weyl星积与关于某个迹泛函$Tr( f\star g)= Tr( f\cdot g)$封闭的规范积联系起来。在闭星积的代数上引入导算子,并证明了相应的莱布尼茨规则对全导数成立。作为一个特殊的例子,我们研究了具有$\mathfrak{su}(2)$型非对易性的空间$R^3_θ$,并证明了在这种情况下,闭星积是由Duflo量子化映射得到的.因此,可以定义拉普拉斯算子,使得其交换极限再现普通交换极限。将变形的莱布尼茨规则应用于标量场理论,导出守恒律和相应的非对易流。

英文摘要:

We consider linear star products on $R^d$ of Lie algebra type. First we derive the closed formula for the polydifferential representation of the corresponding Lie algebra generators. Using this representation we define the Weyl star product on the dual of the Lie algebra. Then we construct a gauge operator relating the Weyl star product with the one which is closed with respect to some trace functional, $Tr( f\star g)= Tr( f\cdot g)$. We introduce the derivative operator on the algebra of the closed star product and show that the corresponding Leibnitz rule holds true up to a total derivative. As a particular example we study the space $R^3_θ$ with $\mathfrak{su}(2)$ type noncommutativity and show that in this case the closed star product is the one obtained from the Duflo quantization map. As a result a Laplacian can be defined such that its commutative limit reproduces the ordinary commutative one. The deformed Leibnitz rule is applied to scalar field theory to derive conservation laws and the corresponding noncommutative currents.

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