Dressed particle

Particle together with excitations from other fields

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In theoretical physics, a dressed particle or clothed particle is a bare particle together with some excitations of other quantum fields that are inseparable from the bare particle. For example, a dressed electron includes the cloud of virtual electron–positron pairs and photons surrounding the original electron. Another example are polaritons ^[1] in solid-state physics, dressed quasiparticles of dipolar excitations in a medium with photons.

In radiobiology, a dressed particle is a bare particle together with its Debye sphere that neutralizes its electric charge.

References

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^ Hopfield, J. J. (1958). "Theory of the Contribution of Excitons to the Complex Dielectric Constant of Crystals". Physical Review. 112 (5): 1555–1567. Bibcode:1958PhRv..112.1555H. doi:10.1103/PhysRev.112.1555.