The effective two-loop Euler-Heisenberg action for
and spinor QED in a general constant background field
Institut für Theoretische Physik, Philosophenweg 16, D-69120 Heidelberg, Germany
Received: 24 March 1998 / Published online: 7 August 1998
Using the Worldline formalism of QED we compute the two-loop effective action induced by a charged scalar, respectively spinor particle in a general constant electromagnetic field.