The antiparticle of a fermion. In a Dirac field, its external wavefunctions are the negative-frequency spinors, while its physical energy is positive. Fermion-number arrows on Feynman diagrams run opposite an antifermion's physical momentum.

Ancestors (8)

  1. Antiparticle
  2. Mode expansion of a Dirac field
  3. Dirac field
  4. Relativistic quantum field
  5. Quantum field theory
  6. Branches of physics
  7. Physics
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