User Tools

Site Tools



Normal Ordering

Recall that to define a quantum field theory of fermions, it is necessary to fill the negative energy sea and to renormalize the infinite mass and charge of the filled states to zero. In modern formulations this is achieved by 'normal ordering' but for our purposes it is better to remain with the more explicit procedure of subtracting the infinities, i.e. renormalizing them.

The Unreasonable Effectiveness of Quantum Field Theory by R. Jackiw

quantum_field_theory/methods/normal_ordering.txt · Last modified: 2017/12/06 09:33 (external edit)