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  The B-field soft theorem and its unification with the graviton and dilaton

Di Vecchia, P., Marotta, R., & Mojaza, M. (2017). The B-field soft theorem and its unification with the graviton and dilaton. Journal of high energy physics: JHEP, 2017(10): 017. doi:https://doi.org/10.1007/JHEP10(2017)017.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-AA4A-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-07BE-5
Genre: Journal Article

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 Creators:
Di Vecchia, Paolo, Author
Marotta, Raffaele, Author
Mojaza, Matin1, Author              
Affiliations:
1Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_24014              

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Free keywords: High Energy Physics - Theory, hep-th
 Abstract: In theories of Einstein gravity coupled with a dilaton and a two-form, a soft theorem for the two-form, known as the Kalb-Ramond B-field, has so far been missing. In this work we fill the gap, and in turn formulate a unified soft theorem valid for gravitons, dilatons and B-fields in any tree-level scattering amplitude involving the three massless states. The new soft theorem is fixed by means of on-shell gauge invariance and enters at the subleading order of the graviton's soft theorem. In contrast to the subsubleading soft behavior of gravitons and dilatons, we show that the soft behavior of B-fields at this order cannot be fully fixed by gauge invariance. Nevertheless, we show that it is possible to establish a gauge invariant decomposition of the amplitudes to any order in the soft expansion. We check explicitly the new soft theorem in the bosonic string and in Type II superstring theories, and furthermore demonstrate that, at the next order in the soft expansion, totally gauge invariant terms appear in both string theories which cannot be factorized into a soft theorem.

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 Dates: 2017-06-092017
 Publication Status: Published in print
 Pages: 27 pages, 1 figure
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 Table of Contents: -
 Rev. Method: -
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Title: Journal of high energy physics : JHEP
Source Genre: Journal
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Publ. Info: Bologna, Italy : Società italiana di fisica
Pages: - Volume / Issue: 2017 (10) Sequence Number: 017 Start / End Page: - Identifier: ISSN: 1126-6708
CoNE: /journals/resource/111021927548002