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Infinite Soft Theorems from Gauge Symmetry

Feb 9, 2018

8 pages

Published in:

Phys.Rev.D 98 (2018) 4, 045004

Published: Aug 7, 2018

e-Print:

1802.03148 [hep-th]

DOI:

10.1103/PhysRevD.98.045004

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Abstract: (APS)

In this paper, we show that the soft behavior of photons and graviton amplitudes, after projection, can be determined to infinite order in soft expansion via ordinary on-shell gauge invariance. In particular, as one of the particle’s momenta becomes soft, gauge invariance relates the nonsingular diagrams of an n-point amplitude to that of the singular ones up to possible homogeneous terms. We demonstrate that with a particular projection of the soft limit the homogeneous terms do not contribute, and one arrives at an infinite soft theorem. This reproduces the result recently derived from the Ward identity of large gauge transformations. We also discuss the modification of these soft theorems due to the presence of higher-dimensional operators.

Formal aspects of field theory, field theory in curved space
invariance: gauge
transformation: gauge
symmetry: gauge
operator: higher-dimensional
Ward identity
gravitation
graviton
photon

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