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Jamister
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- TL;DR Summary
- how to cure infrared divergences in fermion propagator in QED?
Summary: how to cure infrared divergences in fermion propagator in QED?
In calculating the fermion propagator in QED, we identify Ultraviolet and Infrared divergences. the Ultraviolet divergences solved by regularization, but I don't understand how to treat the Infrared divergences. Infrared divergences also appear in the QED vertex, but the solution there to Infrared divergences is by soft photons. How is it done in the fermion propagator?
This is the result of the 1PI diagram of the fermion propagator to leading order:
mu is the mass of the photon.
In calculating the fermion propagator in QED, we identify Ultraviolet and Infrared divergences. the Ultraviolet divergences solved by regularization, but I don't understand how to treat the Infrared divergences. Infrared divergences also appear in the QED vertex, but the solution there to Infrared divergences is by soft photons. How is it done in the fermion propagator?
This is the result of the 1PI diagram of the fermion propagator to leading order:
mu is the mass of the photon.