Vacuum structure and particle production: Role of magnetic moment and pseudoscalar E*B in nonperturbative QED

by Dr Evans Stefan (University of Arizona)

Tuesday 31 May 2022, 12:00 → 13:00 Europe/Athens

We study the QED effective action in externally applied EM fields. Employing the Weisskopf (1936) and Nikishov (1969) summation methods, novel analytical properties of the QED strong field effective action are obtained that are inaccessible to the Schwinger proper time method. Using these rediscovered analytical tools we incorporate anomalous magnetic moment as a correction to the Euler-Heisenberg and Sauter potential step actions. The resulting nonperturbative phenomena include periodicity in the spin g-factor with a cusp at g=2. We discuss how these features can be used to study particle production rates, which are highly sensitive to the pseudoscalar E*B. Future applications to both QED and QCD vacuum structure will be considered.