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Classical off-shell currents
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DOI：10.1007/JHEP03(2023)068.png)
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Abstract
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We consider tree-level off-shell currents of two massive particles and n massless bosons in the classical limit, which can be fused into the classical limit of n + 2 scattering amplitudes. We show that dressing up the current with coherent wave-functions associated with the massive particles leads to the recently proposed Worldline Quantum Field Theory (WQFT) path integral. The currents thus constructed encode solutions of classical equations of motion so they can be applied to contexts where the classical limit is relevant, including hard thermal loops. We give several examples of these currents in scalar, gauge and gravitational theories.
Keywords:
Black Holes
Classical Theories of Gravity
Scattering Amplitudes
Thermal Field Theory
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5.5
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3.9W
Citations:
13.7W
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