• Corpus ID: 119418578

A gauge covariant approximation to QED

  title={A gauge covariant approximation to QED},
We examine the fermion propagator in the Dyson-Schwinger equation which is based on spectral representation.Our approximation preservs vertex Ward-Takahasi Identity.The subtracted dispersion integral smoothes the imaginary part of the self energy and removes the infrared divergence in three dimension.As a result infrared behaviour of the propagator near the threshold is then found to be similar to four dimensional one.There exists analytic solutions for arbitrary gauge in four dimension.In our… 


Quantum Electrodynamics

THE subject of quantum electrodynamics is extremely difficult, even for the case of a single electron. The usual method of solving the corresponding wave equation leads to divergent integrals. To