TY - JOUR

T1 - Celestial IR divergences in general most-subleading-color gluon and gravity amplitudes

AU - Nastase, Horatiu

AU - Rojas, Francisco

AU - Rubio, Carlos

N1 - Publisher Copyright:
© 2022, The Author(s).

PY - 2022/1

Y1 - 2022/1

N2 - Gluon amplitudes at most-subleading order in the 1/N expansion share a remarkable simplicity with graviton amplitudes: collinear divergences are completely absent in both and, as a consequence, their full IR behavior arises from soft gluon/graviton exchange among the external states. In this paper we study the effect of all-loop IR divergences of celestial most-subleading color gluon amplitudes and their similarities with the celestial gravity case. In particular, a simple celestial exponentiation formula for the dipole part can be written. We also analize how this exponentiation is modified by non-dipole contributions. Finally we also show that, in the Regge limit, the soft factor satisfies the Knizhnik-Zamolodchikov equation hinting at the possibility that, in this limit, an effective Wess-Zumino-Witten model would describe the dynamics of the infrared sector.

AB - Gluon amplitudes at most-subleading order in the 1/N expansion share a remarkable simplicity with graviton amplitudes: collinear divergences are completely absent in both and, as a consequence, their full IR behavior arises from soft gluon/graviton exchange among the external states. In this paper we study the effect of all-loop IR divergences of celestial most-subleading color gluon amplitudes and their similarities with the celestial gravity case. In particular, a simple celestial exponentiation formula for the dipole part can be written. We also analize how this exponentiation is modified by non-dipole contributions. Finally we also show that, in the Regge limit, the soft factor satisfies the Knizhnik-Zamolodchikov equation hinting at the possibility that, in this limit, an effective Wess-Zumino-Witten model would describe the dynamics of the infrared sector.

KW - Conformal Field Theory

KW - Scattering Amplitudes

UR - http://www.scopus.com/inward/record.url?scp=85123768094&partnerID=8YFLogxK

U2 - 10.1007/JHEP01(2022)136

DO - 10.1007/JHEP01(2022)136

M3 - Article

AN - SCOPUS:85123768094

SN - 1126-6708

VL - 2022

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 1

M1 - 136

ER -