Re: Why Aren't Infraparticles Already Wigner Particles?

markwh04@xxxxxxxxx wrote:
> Wigner's classification of particles systems as irreducible
> representations of the Poincare' group doesn't apply to charged
> particles.

Why not? Electrons are charged particles and appear in the classification.

> The more general notion of particle classes in the presence
> of long-range forces is that of an "infraparticle".

These are no longer _irreducible_ representations.
Non-free QFT is a matter of suitable reducible representations,
and there are lots of them. Which ones to use is one of the
big questions.

.

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