In quantum field theory, the energy that a particle has as a result of changes that it causes in its environment defines its self-energy Σ {\displaystyle \Sigma } . The self-energy represents the contribution to the particle's energy, or effective mass, due to interactions between the particle and its environment.
In quantum field theory, the energy that a particle has as a result of changes that it causes in its environment defines its self-energy Σ {\displaystyle \Sigma } . The self-energy represents the contribution to the particle's energy, or effective mass, due to interactions between the particle and its environment.
Source: Wikipedia "Self-energy" · CC BY-SA 4.0
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