Doppler and transit broadening effects inherent in a thermal atomic beam reduce the size of quantum fluctuations in a cavity QED system. A cold continuous atomic beam would reduce these effects, but would not eliminate the different atom–field couplings associated with the random distribution of atoms throughout the cavity. We present results that describe the effect that this has on quantum fl...

A bstract In 2+1 dimensions, we propose a renormalizable non-linear sigma model action which describes the $$ \mathcal{N} N = 2 supersymmetric generalization of Galilean Electrodynamics. We first start with simplest obtained by null reduction relativistic Abelian 1 QED in 3+1 dimensions and study its renormal...

Summation of diagrams in N = 1 supersymmetric electrodynamics, regularized by higher derivatives. Abstract For the massless N = 1 supersymmetric electrodynamics, regularized by higher derivatives, the Feynman diagrams, which define the divergent part of the two-point Green function and can not be found from Schwinger-Dyson equations and Ward identities, are partially summed. The result can be w...

Investigation of the anomaly puzzle in N = 1 supersymmetric electrodynamics. Abstract Using Schwinger-Dyson equations and Ward identities in N = 1 supersym-metric electrodynamics, regularized by higher derivatives, we find, that it is possible to calculate some contributions to the two-point Green function of the gauge field and to the β-function exactly to all orders of the perturbation theory...