Student Friendly Introduction to QFT · Problem 24

Spinors: Spin ½ Fields

Physics — QFT · dirac-hamiltonian-third-lines

Problem

Following steps like (4-70) to (4-73) for the third lines of (4-68) and (4-69), show that the sum of those third lines is ∑r,pEp cr†(p)cr(p)\sum_{r,\mathbf{p}} E_\mathbf{p}\, c_r^\dagger(\mathbf{p}) c_r(\mathbf{p}).

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