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arXiv 1907.03079hep-phcond-mat.other
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在Minkowski空间中求解费米子-标量系统的Bethe-Salpeter方程

Solving the Bethe-Salpeter Equation in Minkowski Space for a Fermion-Scalar system

J. H. Alvarenga Nogueira, D. Colasante, V. Gherardi, T. Frederico, E. Pace, G. Salmè

摘要:

首次在Minkowski空间中求解了由费米子和标量玻色子组成的束缚(1/2)+系统的阶梯Bethe-Salpeter方程.正式的工具是相同的已经成功地通过了两个标量和两个费米子系统,即Nakanishi积分表示的Bethe-Salpeter振幅和光前投影的满足方程。数值结果给出并讨论了两个相互作用内核:i)大量的标量交换和ii)大量的矢量交换,说明结合能和相互作用耦合常数之间的相关性,以及相互作用态的价含量,通过价概率和光阵面动量分布。在标量交换的情况下,一个有趣的副作用,要归因于由狄拉克旋量的小组件所产生的排斥,指出,而对于矢量交换的螺旋度守恒的表现形式打开了新的有趣的问题,要解决在一个完全非微扰的框架内,以及发病的尺度不变制度。

英文摘要:

The ladder Bethe-Salpeter Equation of a bound (1/2)+ system, composed by a fermion and a scalar boson, is solved in Minkowski space, for the first time. The formal tools are the same already successfully adopted for two-scalar and two-fermion systems, namely the Nakanishi integral representation of the Bethe-Salpeter amplitude and the light-front projection of the fulfilled equation. Numerical results are presented and discussed for two interaction kernels: i) a massive scalar exchange and ii) a massive vector exchange, illustrating both the correlation between binding energies and the interaction coupling constants, as well as the valence content of the interacting state, through the valence probabilities and the light-front momentum distributions. In the case of the scalar exchange, an interesting side effect, to be ascribed to the repulsion generated by the small components of the Dirac spinor, is pointed out, while for the vector exchange the manifestation of the helicity conservation opens new interesting questions to be addressed within a fully non-perturbative framework, as well as the onset of a scale-invariant regime.

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