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MP: Fachverband Theoretische und Mathematische Grundlagen der Physik

MP 14: Posters (Montag - Donnerstag)

MP 14.1: Poster

Freitag, 22. März 2019, 09:00–09:00, HS 23

Dynamically Assisted Schwinger Effect — Chen Lan¹, •Yi-Fan Wang², Huifang Geng¹, and Alexander Andreev^1,3 — ¹ELI-ALPS, ELI-Hu NKft, Dugonics tér 13, H-6720 Szeged, Ungarn — ²Institut für Theoretische Physik, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Deutschland — ³Saint-Petersburg State University, Ulyanovskaya str. 1, Petrodvorets, Saint-Petersburg 198504, Russland

At strong coupling, the scalar Schwinger effect is studied by the field-theoretical method of worldline instantons for dynamic fields of single-pulse and sinusoidal types. By examining the Wilson loop along the closed instanton path, corrections to the results at weak coupling are discovered. They show that: a) since the additional terms depend on strength of the background field, the Wilson loop becomes non-negligible even in the extreme weak-field limit; and b) a breaking of weak-field condition similar to constant field also happens beyond the critical field. In other words, considerations at strong coupling turn out to be indispensable for strongly dynamic field. Therefore, following Semenoff and Zarembo’s proposal, the Schwinger effect at strong coupling is studied with an N = 4 supersymmetric Yang–Mills theory in the Coulomb phase. With the help of the gauge/gravity duality, the vacuum decay rate is evaluated by the string action with instanton worldline as boundary, which is located on a probe D3–brane. The corresponding classical worldsheets are estimated by perturbing the integrable case of a constant field.