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arXiv 0901.4073hep-thgr-qchep-lat
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D-膜束缚态的形状及其拓扑变化

On the shape of a D-brane bound state and its topology change

Tatsuo Azeyanagi, Masanori Hanada, Tomoyoshi Hirata, Hidehiko Shimada

摘要:

众所周知,D-膜的坐标由NxN矩阵描述。从一般的非交换矩阵中,很难提取物理,例如D-膜位置分布的形状。为了克服这个问题,我们概括和阐述了一个简单的处方,首先介绍了Hotta,西村和土屋,它确定了最合适的规范,使对角分量(D-膜位置)和非对角分量之间的分离。这个公式使得直接从矩阵中提取D-膜的分布成为可能。我们通过将其应用于各种低维Yang-Mills矩阵模型的蒙特卡罗模拟来验证它的能力。特别是,我们检测到的D-膜束缚态的矩阵模型的相变的拓扑结构的变化,这种相变的存在是预期从规范/引力对偶,和拓扑结构的变化的模式是惊人的相似,在重力方面的对应物,黑洞/黑弦过渡。我们还提出了一个标准,基于非对角分量的行为,这决定了我们的处方时,给出了一个合理的定义D-膜的位置。我们提供了数值证据,我们的标准是满足典型的D膜之间的距离。对于超对称模型,D-膜的位置甚至可以在更短的距离尺度下定义。非对角元的行为在这个分析中发现了一些支持以前的研究D-膜束缚态。

英文摘要:

As is well known, coordinates of D-branes are described by NxN matrices. From generic non-commuting matrices, it is difficult to extract physics, for example, the shape of the distribution of positions of D-branes. To overcome this problem, we generalize and elaborate on a simple prescription, first introduced by Hotta, Nishimura and Tsuchiya, which determines the most appropriate gauge to make the separation between diagonal components (D-brane positions) and off-diagonal components. This prescription makes it possible to extract the distribution of D-branes directly from matrices. We verify the power of it by applying it to Monte-Carlo simulations for various lower dimensional Yang-Mills matrix models. In particular, we detect the topology change of the D-brane bound state for a phase transition of a matrix model; the existence of this phase transition is expected from the gauge/gravity duality, and the pattern of the topology change is strikingly similar to the counterpart in the gravity side, the black hole/black string transition. We also propose a criterion, based on the behavior of the off-diagonal components, which determines when our prescription gives a sensible definition of D-brane positions. We provide numerical evidence that our criterion is satisfied for the typical distance between D-branes. For a supersymmetric model, positions of D-branes can be defined even at a shorter distance scale. The behavior of off-diagonal elements found in this analysis gives some support for previous studies of D-brane bound states.

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