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arXiv 2010.04078hep-phphysics.plasm-ph
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极化QED级联

Polarized QED cascades

Daniel Seipt, Christopher P. Ridgers, Dario Del Sorbo, Alec G. R. Thomas

摘要:

通过在强场QED过程中考虑电子、正电子和光子的自旋和极化,我们发现在超强激光场中QED级联的增长率可以大大降低.虽然这意味着产生的粒子更少,但我们也发现它们是高度极化的。我们进一步发现,粒子光谱的高能尾部的极化与Sokolov-Ternov理论的预期相反,这不能仅仅通过考虑对产生过程中的自旋不对称性来解释,而是由“自旋离散”引起的。我们采用一个动力学方程的方法的电子,正电子和光子的分布,他们每个人的自旋/偏振分辨,与量子电动力学的光子发射和对生产的影响建模的自旋/偏振相关的玻尔兹曼型碰撞算子。对于光子种子级联,根据光子偏振,我们发现在级联发展的早期阶段,粒子生产过剩或短缺,这提供了一条通往受控实验的道路。在本文中,我们专注于旋转电场配置,这代表了一个理想化的模型,并允许一个简单的解释所观察到的效果。

英文摘要:

By taking the spin and polarization of the electrons, positrons and photons into account in the strong-field QED processes of nonlinear Compton emission and pair production, we find that the growth rate of QED cascades in ultra-intense laser fields can be substantially reduced. While this means that fewer particles are produced, we also found them to be highly polarized. We further find that the high-energy tail of the particle spectra is polarized opposite to that expected from Sokolov-Ternov theory, which cannot be explained by just taking into account spin-asymmetries in the pair production process, but results significantly from "spin-straggling". We employ a kinetic equation approach for the electron, positron and photon distributions, each of them spin/polarization-resolved, with the QED effects of photon emission and pair production modelled by a spin/polarization dependent Boltzmann-type collision operator. For photon-seeded cascades, depending on the photon polarization, we find an excess or a shortage of particle production in the early stages of cascade development, which provides a path towards a controlled experiment. Throughout this paper we focus on rotating electric field configuration, which represent an idealized model and allows for a straightforward interpretation of the observed effects.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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