The perspectives of studying vacuum birefringence at the Gamma Factory are explored. To this end, the parameter regime which can be reliably analyzed resorting to the leading contribution to the Heisenberg–Euler effective Lagrangian is assessed in detail. It is explicitly shown that—contrary to naive expectations—this approach allows for the accurate theoretical study of quantum vacuum signatures up to fairly large photon energies. The big advantage of this parameter regime is the possibility of studying the phenomenon in experimentally realistic, manifestly inhomogeneous pump and probe field configurations. Thereafter, two specific scenarios giving rise to a vacuum birefringence effect for traversing gamma probe photons are analyzed. In the first scenario the birefringence phenomenon is induced by a quasi-constant static magnetic field. In the second case it is driven by a counter-propagating high-intensity laser field.

中文翻译：

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伽玛工厂的真空双折射

探讨了在伽马工厂研究真空双折射的观点。为此，详细评估了借助对 Heisenberg-Euler 有效拉格朗日量的主要贡献可以可靠分析的参数机制。它明确表明——与天真的预期相反——这种方法允许对量子真空特征进行准确的理论研究，直至相当大的光子能量。这种参数方案的一大优势是可以在实验上现实的、明显不均匀的泵和探头场配置中研究这种现象。此后，分析了两种特定情况，它们会引起用于穿越伽马探针光子的真空双折射效应。在第一种情况下，双折射现象是由准恒定静磁场引起的。