arXiv 1902.043882019-02-12hep-thhep-ph

重离子碰撞中磁单极子的Schwinger产生

Towards Schwinger production of magnetic monopoles in heavy-ion collisions

Oliver Gould, David L. -J. Ho, Arttu Rajantie

发表信息：: Phys. Rev. D 100, 015041 (2019)
DOI：: 10.1103/PhysRevD.100.015041

摘要：

磁单极子可能是由周围重离子碰撞的强磁场中的施温格效应产生的。我们回顾了这种碰撞中的电磁场的形式，并从第一性原理计算了双光子对产生的截面。使用世界线瞬子方法，我们的工作，在磁荷的所有订单，因此不受微扰理论的故障。我们的结果依赖于时空的不均匀性通过一个单一的无量纲参数，Keldysh参数，这是独立的碰撞能量为一个给定的质量。对于现实的重离子碰撞，计算的计算成本变得令人望而却步，有限的大小的单极子需要考虑在内，因此我们目前的结果是不适用于他们。尽管如此，我们的结果表明，时空依赖性提高了生产截面，因此将导致更强的质量边界比在恒定场的情况下。

英文摘要：

Magnetic monopoles may be produced by the Schwinger effect in the strong magnetic fields of peripheral heavy-ion collisions. We review the form of the electromagnetic fields in such collisions and calculate from first principles the cross section for monopole pair production. Using the worldline instanton method, we work to all orders in the magnetic charge, and hence are not hampered by the breakdown of perturbation theory. Our result depends on the spacetime inhomogeneity through a single dimensionless parameter, the Keldysh parameter, which is independent of collision energy for a given monopole mass. For realistic heavy-ion collisions, the computational cost of the calculation becomes prohibitive and the finite size of the monopoles needs to be taken into account, and therefore our current results are not applicable to them. Nonetheless, our results show that the spacetime dependence enhances the production cross section and would therefore lead to stronger monopole mass bounds than in the constant-field case.

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