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Title:
New Ideas about Long Distance Physics
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Abstract:
Quantum Mechanics and Relativity suggest that long-distance physics is governed by the interactions ofmassless particles. From symmetry considerations alone, the polarization states of massless particles can transform covariantly under boosts, with a degree of mixing determined by a dimensional quantum number rho. The case of Lorentz-invariant helicities corresponds to rho=0, which is what we find in familiar gauge
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