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Low-energy behavior of gluons and gravitons from gauge invariance
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. University of Copenhagen, Denmark .
2014 (English)In: Physical Review D, ISSN 1550-7998, Vol. 90, no 8, 084035- p.Article in journal (Refereed) Published
Abstract [en]

We show that at tree level, on-shell gauge invariance can be used to fully determine the first subleading soft-gluon behavior and the first two subleading soft-graviton behaviors. Our proofs of the behaviors for n-gluon and n-graviton tree amplitudes are valid in D dimensions and are similar to Low's proof of universality of the first subleading behavior of photons. In contrast to photons coupling to massive particles, in four dimensions the soft behaviors of gluons and gravitons are corrected by loop effects. We comment on how such corrections arise from this perspective. We also show that loop corrections in graviton amplitudes arising from scalar loops appear only at the second soft subleading order. This case is particularly transparent because it is not entangled with graviton infrared singularities. Our result suggests that if we set aside the issue of infrared singularities, soft-graviton Ward identities of extended Bondi, van der Burg, Metzner and Sachs symmetry are not anomalous through the first subleading order.

Place, publisher, year, edition, pages
2014. Vol. 90, no 8, 084035- p.
Keyword [en]
Gravitational Waves, General Relativity, Spin 1/2, Scattering, Photons, Theorem, Bremsstrahlung, Factorization, Amplitudes, Systems
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:kth:diva-157003DOI: 10.1103/PhysRevD.90.084035ISI: 000344022900006ScopusID: 2-s2.0-84908191944OAI: diva2:769036

QC 20141205

Available from: 2014-12-05 Created: 2014-12-04 Last updated: 2014-12-05Bibliographically approved

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Di Vecchia, Paolo
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