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arXiv 1206.6375hep-thgr-qchep-latmath-phmath.MP
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超对称性对Yang-Mills矩阵模型II中涌现几何的影响

Impact of Supersymmetry on Emergent Geometry in Yang-Mills Matrix Models II

Badis Ydri

摘要:

利用Monte Carlo方法研究了具有SO(3)质量项的D=4超对称Yang-Mills矩阵模型.在玻色子模型中,我们证明了存在一个奇异的第一/第二阶过渡从一个相位与一个定义良好的背景几何(模糊球)到一个相位与交换矩阵没有几何意义上的Connes。在转变点,球突然膨胀到无限大,然后随着温度(规范耦合常数)的增加而蒸发。由于作用的不连续性,转变看起来是一阶的,而由于比热的发散峰,转变看起来是二阶的。超对称模型的模糊球是稳定的,因为玻色相变变成了一个非常慢的交叉转变。发现转变点随N缩放到零。我们推测从背景球到交换矩阵相的转变与自发超对称破缺有关。我们发现,在一个半径为R的实心球内,四个玻色矩阵的联合概率分布是均匀的,由此得到的一个非多项式规律给出了任一玻色矩阵在矩阵相中的特征值分布。背景几何上的规范场的本征值也是按这种非多项式规律分布的。

英文摘要:

We present a study of D=4 supersymmetric Yang-Mills matrix models with SO(3) mass terms based on the Monte Carlo method. In the bosonic models we show the existence of an exotic first/second order transition from a phase with a well defined background geometry (the fuzzy sphere) to a phase with commuting matrices with no geometry in the sense of Connes. At the transition point the sphere expands abruptly to infinite size then it evaporates as we increase the temperature (the gauge coupling constant). The transition looks first order due to the discontinuity in the action whereas it looks second order due to the divergent peak in the specific heat. The fuzzy sphere is stable for the supersymmetric models in the sense that the bosonic phase transition is turned into a very slow crossover transition. The transition point is found to scale to zero with N. We conjecture that the transition from the background sphere to the phase of commuting matrices is associated with spontaneous supersymmetry breaking. The eigenvalues distribution of any of the bosonic matrices in the matrix phase is found to be given by a non-polynomial law obtained from the fact that the joint probability distribution of the four matrices is uniform inside a solid ball with radius R. The eigenvalues of the gauge field on the background geometry are also found to be distributed according to this non-polynomial law.

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