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arXiv 1609.07919math.CO
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余正张量检测及其在物理和超图中的应用

Copositive Tensor Detection and Its Applications in Physics and Hypergraphs

Haibin Chen, Zhanghai Huang, Liqun Qi

摘要:

张量的余正性在一般标量势的真空稳定性、多项式优化、张量互补性问题和张量广义本征值互补性问题中起着重要的作用。本文提出了一种新的高阶张量共正性的判定算法,并给出了该算法在物理学和超图中的应用。为此,我们首先给出了基于单形的代表矩阵的张量的几个新的共正性条件。利用Z-张量的共正性定义了共正张量锥的一个适当的凸子锥,并给出了一个新的算法。进一步,通过考虑平方和规划问题,定义了共正张量锥的两个新子集,并讨论了它们的凸性。作为该算法的应用,我们证明了一致超图的角点数与完全正张量锥上的最优化问题等价,从而表明该算法可用于计算一致超图的角点数的上界.然后,我们研究了该算法在粒子物理中的另一个应用,即检验某些势场的共正性。最后给出了各种数值例子来说明算法的性能。

英文摘要:

Copositivity of tensors plays an important role in vacuum stability of a general scalar potential, polynomial optimization, tensor complementarity problem and tensor generalized eigenvalue complementarity problem. In this paper, we propose a new algorithm for testing copositivity of high order tensors, and then present applications of the algorithm in physics and hypergraphs. For this purpose, we first give several new conditions for copositivity of tensors based on the representative matrix of a simplex. Then a new algorithm is proposed with the help of a proper convex subcone of the copositive tensor cone, which is defined via the copositivity of Z-tensors. Furthermore, by considering a sum-of-squares program problem, we define two new subsets of the copositive tensor cone and discuss their convexity. As an application of the proposed algorithm, we prove that the coclique number of a uniform hypergraph is equivalent with an optimization problem over the completely positive tensor cone, which implies that the proposed algorithm can be applied to compute an upper bound of the coclique number of a uniform hypergraph. Then we study another application of the proposed algorithm on particle physics in testing copositivity of some potential fields. At last, various numerical examples are given to show the performance of the algorithm.

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