Erlangen 2026 – wissenschaftliches Programm

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MP: Fachverband Theoretische und Mathematische Grundlagen der Physik

MP 10: Strong Fields

MP 10.3: Vortrag

Donnerstag, 19. März 2026, 14:15–14:30, KH 02.013

Detection schemes for quantum vacuum birefringence — •Naser Ahmadiniaz¹, Thomas Cowan^1,2, Christian Kohlfürst¹, Roland Sauerbrey¹, Michal Smid¹, Toma Toncian¹, and Ralf Schützhold^1,3 — ¹Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany — ²Institut für Kern und Teilchenphysik, Technische Universität Dresden, 01062 Dresden, Germany — ³Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden, Germany

Strong electromagnetic fields can not only create matter but also turn the quantum vacuum into an anisotropic medium. This effect is called vacuum birefringenc. Motivated by recent experimental initiatives of the BIREF@HIBEF collaboration at the Helmholtz International Beamline for Extreme Fields (HIBEF) of the HED instrument at the European XFEL, we study birefringent scattering of x-rays in the strong field of high-intensity optical lasers and compare several beam geometries. Special emphasis is placed on scenarios where signal and background photons differ in polarization, propagation direction, and possibly energy, in order to enhance detectability.

[1] N. Ahmadiniaz, C. Bähtz et al. (BIREF@HIBEF Collaboration), High Power Laser Science and Engineering 13 (2025).

[2] N. Ahmadiniaz, T.E. Cowan et al. Phys. Rev. D 108, 076005 (2023).

Keywords: Strong field QED; Vacuum Birefringence