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Fractional Soft Limits of Scattering Amplitudes

Tomáš Brauner1, Angelo Esposito2, Riccardo Penco3

  • 1Department of Mathematics and Physics, University of Stavanger, N-4036 Stavanger, Norway.

Physical Review Letters
|June 24, 2022
PubMed
Summary

The scattering amplitude of phonons, which are Nambu-Goldstone bosons in solids, can unexpectedly vanish with fractional powers of momentum. This challenges the conventional integer power scaling for soft boson scattering.

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