An **infraparticle** refers to a conceptual particle in theoretical physics that is characterized by an infinite wavelength. This concept arises primarily in the context of quantum field theory (QFT) and is often discussed in relation to particles that have non-trivial mass or momentum distributions. Infraparticles differ from standard particles in several ways: 1. **Infinite Wavelength**: Since infraparticles have infinite wavelength, they cannot be described by the usual relation between energy and momentum.
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