Self-energy refers to the energy that a particle possesses due to its own field or interactions with its own electromagnetic field. This concept arises in various branches of physics, particularly in quantum field theory and electromagnetism. Here are some key points regarding self-energy: 1. **Electromagnetic Self-Energy**: In classical electrodynamics, the self-energy of a charged particle, such as an electron, considers the energy associated with its own electric field.
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A self-energy is the loop contribution to a one-particle-irreducible two-point function. Repeated self-energy insertions form a geometric series that shifts the propagator pole and changes its residue.