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Tomáš Brauner on Muck Rack

Tomáš Brauner

As seen in: Physical Review B
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Fractional Soft Limits of Scattering Amplitudes

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By Angelo Esposito, Riccardo Penco, Carnegie Mellon, Tomáš Brauner
| Physical Review B
Abstract It is a common lore that the amplitude for a scattering process involving one soft Nambu-Goldstone boson should scale like an integer power of the soft momentum. We revisit this expectation by considering the 2→2 scattering of phonons in solids. We show that, depending on the helicities of the phonons involved in the scattering process, the scattering amplitude may in fact vanish like a fractional power of the soft momentum.
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