One of Schwinger's key achievements was renormalizing QED to what?
One loop order
Two loop order
Three loop order
Zero loop order
Answer
Renormalizing quantum electrodynamics (QED) to one loop order was achieved by Schwinger, which is considered a key accomplishment. This refers to the process of removing infinities that arise in QED calculations, allowing for finite and meaningful predictions. It involves introducing a cutoff or regularization scheme to handle divergent integrals and then systematically eliminating these infinities through a perturbative expansion, resulting in a renormalized theory with well-defined physical quantities.
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