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arXiv 1004.4483hep-thmath-phmath.MP
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弱弯曲背景下非对易性的正则方法

Noncommutativity in weakly curved background by canonical methods

Lj. Davidović, B. Sazdović

摘要:

利用正则方法研究了弱弯曲背景下$Dp-$膜世界体积的非对易性。术语弱弯曲意味着在首阶中,非平坦性的源是在坐标中线性的无穷小Kalb-Ramond场$B_{μν}$,而Ricci张量作为二阶的无穷小没有贡献。在边界条件的求解上,我们用有效坐标和动量给出了时空坐标的简单表达式。这个基本关系帮助我们证明了非对易性只出现在世界片的边界上。非对易性参数有一个标准形式,但具有无穷小和坐标相关的反对称张量$B_{μν}$。这个结果与在流代数的大水平$n$极限下的群流形上得到的结果一致。量子化后的Dp-膜世界体积上的函数代数用Kontsevich星积代替了平坦背景下的Moyal星积。

英文摘要:

Using canonical method we investigate $Dp-$brane world-volume noncommutativity in weakly curved background. The term weakly curved means that in the leading order, the source of non-flatness is infinitesimally small Kalb-Ramond field $B_{μν}$ linear in coordinate, while the Ricci tensor does not contribute being the infinitesimal of the second order. On the solution of boundary conditions, we find simple expression for the space-time coordinates in terms of the effective coordinates and momenta. This basic relation helped us to prove that noncommutativity appears only on the world-sheet boundary. The noncommutativity parameter has a standard form but with infinitesimally small and coordinate dependent antisymmetric tensor $B_{μν}$. This result coincides with that obtained on the group manifolds in the limit of the large level $n$ of current algebra. After quantization the algebra of functions on Dp-brane world-volume is represented with the Kontsevich star product instead of the Moyal one in the flat background.

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