Erlangen 2026 – scientific programme

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T: Fachverband Teilchenphysik

T 24: Standard Model Physics II

T 24.6: Talk

Tuesday, March 17, 2026, 17:30–17:45, KH 00.014

Probing vacuum dispersion with electron-laser interactions — •Anthony Hartin — LMU, Munich, Germany

Partice physics processes occurring in the strong field of an intense laser can only be fully described by a quantum field theory that is non-perturbative with respect to the strong field. Such a theory is provided by the Furry interaction picture where the strong field is included in exact solutions of the Dirac equation. These solutions describe a new particle, the bound fermion, which sees a structured space-time depending on where it is in relation to the kinematics and phase of the strong field. This theory predicts novel phenomenology, including a shift in rest mass of the bound fermion, a dispersive vacuum and consequently, novel resonances in the bound fermion propagator. We review the theory and phenomenology and propose an experiment which can detect these novel non-perturbative resonances.

Keywords: Non-perturbative; QED; lasers; fermion; Furry