Bhatnagar, Shashank (PhD)Mengistu, Haimanot2018-06-272023-11-092018-06-272023-11-092011-06http://10.90.10.223:4000/handle/123456789/3840In this paper interacting quantum elds,electron self-energy,vacuum polarization,methods of calculating electron and photon self-energy and Wick rotation are reviewed.These self- energy calculating methods include Pauli-Villars regularization and dimensional regular- iztion.Electron self-energy is calculated by using Pauli-Villars regularization method while the photon self-energy is by dimensional regularization methodenMethod of Dimensional RegularizationCalculation of Electron Self Energy and Vaccum Polarization by using the Method of Dimensional RegularizationThesis