On-shell derivation of the soft effective action in Abelian gauge theories

We derive the soft effective action in ( d + 2 )-dimensional Abelian gauge theories from the on-shell action obeying Neumann boundary conditions at timelike and null infinity and Dirichlet boundary conditions at spatial infinity. This allows us to identify the on-shell degrees of freedom on the boun...

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Bibliographic Details
Published in:Physical review. D 2024-06, Vol.109 (12), Article 125016
Main Authors: He, Temple, Mitra, Prahar, Sivaramakrishnan, Allic, Zurek, Kathryn M.
Format: Article
Language:English
Subjects:
Gauge theories
Quantum field theory
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Summary:We derive the soft effective action in ( d + 2 )-dimensional Abelian gauge theories from the on-shell action obeying Neumann boundary conditions at timelike and null infinity and Dirichlet boundary conditions at spatial infinity. This allows us to identify the on-shell degrees of freedom on the boundary with the soft modes living on the celestial sphere. Following the work of Donnelly and Wall, this suggests that we can interpret soft modes as entanglement edge modes on the celestial sphere and study entanglement properties of soft modes in Abelian gauge theories.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.109.125016