Amplitudes, Observables, and Classical Scattering

2018/11/27 by David A. Kosower, Ben Maybee, Donal O'Connell · 1 voice · 2 citations
Physics and Astronomy · #gr-qc #hep-th

paper · pdf · doi:10.1007/jhep02(2019)137

76 pages

arxiv created 2018/11/27 · arxiv published 2018/11/27 · arxiv updated 2019/03/27

Abstract

We present a formalism for computing classically measurable quantities directly from on-shell quantum scattering amplitudes. We discuss the ingredients needed for obtaining the classical result, and show how to set up the calculation to derive the result efficiently. We do this without specializing to a specific theory. We study in detail two examples in electrodynamics: the momentum transfer in spinless scattering to next-to-leading order, and the momentum radiated to leading order.

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Discussions

• Given a quantum system where the energy spectrum is degenerate in the orbital quantum number, is this property manifested somehow in the corresponding scattering amplitude at different orders in pertu [stackexchange, 2 points]

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