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arXiv 0904.0629hep-th
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单参数或多参数M理论背景下的Beta、偶极和非对易形变

Beta, Dipole and Noncommutative Deformations of M-theory Backgrounds with One or More Parameters

Aybike Catal-Ozer, Nihat Sadik Deger

摘要:

我们从包含5个U(1)等距的解出发构造新的M-理论解。我们通过沿着5-torus方向之一减少,然后通过O(4,4)矩阵的作用进行T-对偶并提升回11维来做到这一点。特殊的T-对偶变换是嵌入O(4,4)中的O(2,2)变换序列,其中每个O(2,2)的作用给出10维的Lunin-Maldacena变形。当初始11维背景的4-形式沿5-环面最多有一条腿时,我们找到了单参数和多参数变形解的度量和4-形式场的一般公式。新解中的所有变形项都是以5 × 5矩阵的子行列式给出的,该矩阵表示5-环面上的度量。我们将这些结果应用于AdS_r x X^{11-r}型的几个M-理论背景。通过适当的选择的T-对偶和减少方向,我们得到类似的β,偶极和非交换变形。我们还提供了只有3或4个U(1)等距的背景公式,并研究了一个情况下,我们的假设为4-形式的字段被违反。

英文摘要:

We construct new M-theory solutions starting from those that contain 5 U(1) isometries. We do this by reducing along one of the 5-torus directions, then T-dualizing via the action of an O(4,4) matrix and lifting back to 11-dimensions. The particular T-duality transformation is a sequence of O(2,2) transformations embedded in O(4,4), where the action of each O(2,2) gives a Lunin-Maldacena deformation in 10-dimensions. We find general formulas for the metric and 4-form field of single and multiparameter deformed solutions, when the 4-form of the initial 11-dimensional background has at most one leg along the 5-torus. All the deformation terms in the new solutions are given in terms of subdeterminants of a 5x5 matrix, which represents the metric on the 5-torus. We apply these results to several M-theory backgrounds of the type AdS_r x X^{11-r}. By appropriate choices of the T-duality and reduction directions we obtain analogues of beta, dipole and noncommutative deformations. We also provide formulas for backgrounds with only 3 or 4 U(1) isometries and study a case, for which our assumption for the 4-form field is violated.

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