Título:
Loop corrected soft photon theorem as a Ward identity
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Autor:
Campiglia Curcho, Miguel
Laddha, A.
Laddha, A.
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Tipo de documento:
Artículo
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Palabras clave:
Gauge Symmetry
Global Symmetries
Scattering Amplitudes
Global Symmetries
Scattering Amplitudes
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Año de publicación:
2019
Contenido:
Resumen:
Recently Sahoo and Sen obtained a series of remarkable results concerning subleading soft photon and graviton theorems in four dimensions. Even though the S-matrix is infrared divergent, they have shown that the subleading soft theorems are well defined and exact statements in QED and perturbative Quantum Gravity. However unlike the well studied Cachazo-Strominger soft theorems in tree-level amplitudes, the new subleading soft expansion is at the order ln ω (where ω is the soft frequency) and the corresponding soft factors structurally show completely different properties then their tree-level counterparts. Whence it is natural to ask if these theorems are associated to asymptotic symmetries of the S-matrix. We consider this question in the context of sub-leading soft photon theorem in scalar QED and show that there are indeed an infinity of conservation laws whose Ward identities are equivalent to the loop-corrected soft photon theorem. This shows that in the case of four dimensional QED, the leading and sub-leading soft photon theorems are equivalent to Ward identities of (asymptotic) charges.
Descripción:
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Editorial:
Scuola Internazionale Superiore di Studi Avanzati (SISSA)
EN:
Journal of High Energy Physics, 2019:287
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Citación:
Campiglia Curcho, M y Ladda, A. "Loop corrected soft photon theorem as a Ward identity". Journal of High Energy Physics. [en línea] 2019:287. 31 h..DOI: 10.1007/JHEP05(2019)287
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ISSN:
1029-8479
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Licencia:
Licencia Creative Commons Atribución (CC - By 4.0)
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| Ficheros | Descripción | Tamaño | Formato | ||
|---|---|---|---|---|---|
| 10.1007JHEP10(2019)287.pdf | — | 613.97 KB | Adobe PDF |