Vacuum polarisation tensors in constant electromagnetic fields: Part II

Vacuum Polarisation Tensors in Constant Electromagnetic Fields: Part II

In the second part of this series we apply the “string-inspired” technique to the calculation of one-loop amplitudes involving both vectors and axialvectors, as well as a general constant electromagnetic background field. The vector-axialvector two-point function in a constant field is calculated explicitly.

Vacuum Polarisation Tensors in Constant Electromagnetic Fields: Part I

The string-inspired technique is used for the calculation of vacuum polarisation tensors in constant electromagnetic fields. In the first part of this series, we give a detailed exposition of the method for the case of the QED one-loop N-photon amplitude in a general constant electromagnetic background field. The twopoint cases are calculated explicitly, leading to compact representations for t...

Vacuum Polarisation Tensors in Constant Electromagnetic Fields: Part III

The string-inspired technique is used for a first calculation of the one-loop axialvector vacuum polarisation in a general constant electromagnetic field. A compact result is reached for the difference between this tensor and the corresponding vector vacuum polarisation. This result is confirmed by a Feynman diagram calculation. Its physical relevance is briefly discussed.

Electromagnetic Fields in the Qcd Vacuum

Quarks play an active role in shaping the QCD vacuum structure. Being dual carriers of both ‘color’ and ‘electric’ charges they also respond to externally applied electromagnetic fields. Thus, in principle, the vacuum of strong interactions influences higher order QED processes such as photon-photon scattering. We survey here the current status of the understanding of the vacuum structure of st...

Vacuum birefringence in strong inhomogeneous electromagnetic fields