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

Năstase, Horaţiu; Rojas, Francisco; Rubio, Carlos

doi:10.1007/jhep01(2022)136

Cited by 9 publications

(4 citation statements)

References 36 publications

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“…First, the eikonal phase χ is operator valued for all spins j = 1. This feature of CCFT is familiar from both celestial double copy constructions [29,88] and the conformally soft exponentiation of infrared divergences in gravity [41,47,89,90]. Second, it looks remarkably similar to the eikonal amplitude in AdS [54].…”

Section: Jhep03(2023)030mentioning

confidence: 75%

Eikonal approximation in celestial CFT

Gioia

Raclariu

2023

J. High Energ. Phys.

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We identify an eikonal regime in celestial CFT2 in which massless 2-2 scattering is dominated by t-channel exchange. We derive a formula for the celestial amplitude that resums exchanges of arbitrary integer spin to all orders in the coupling. The resulting eikonal phase takes the same form as in flat space with the powers of center-of-mass energy replaced by weight-shifting operators on the celestial sphere. We independently compute the celestial two-point function for a scalar propagating in a shockwave background and show that to leading order in the gravitational coupling and for a suitable choice of the source, the result agrees with the prediction from the celestial eikonal formula for graviton exchange. We demonstrate that this two-point function can be directly obtained from the corresponding formula in AdS4 in a flat space limit. We finally establish a general relation between scalar celestial amplitudes in celestial CFTd−1 and the flat space limit of scalar AdSd+1 Witten diagrams.

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Section: Jhep03(2023)030mentioning

confidence: 75%

Eikonal approximation in celestial CFT

Gioia

Raclariu

2023

J. High Energ. Phys.

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“…[464], and further extended in Ref. [465], studying special colour configurations and the high-energy limit of four-point amplitudes 32 . In principle, existing gauge-theory data can be used to explore the non-linear generalisation of Eq.…”

Section: A Celestial Viewmentioning

confidence: 97%

The Infrared Structure of Perturbative Gauge Theories

Agarwal¹,

Magnea²,

Signorile-Signorile³

2021

Preprint

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Infrared divergences in the perturbative expansion of gauge theory amplitudes and cross sections have been a focus of theoretical investigations for almost a century. New insights still continue to emerge, as higher perturbative orders are explored, and high-precision phenomenological applications demand an ever more refined understanding. This review aims to provide a pedagogical overview of the subject. We briefly cover some of the early historical results, we provide some simple examples of low-order applications in the context of perturbative QCD, and discuss the necessary tools to extend these results to all perturbative orders. Finally, we describe recent developments concerning the calculation of soft anomalous dimensions in multi-particle scattering amplitudes at high orders, and we provide a brief introduction to the very active field of infrared subtraction for the calculation of differential distributions at colliders.

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“…Attempts to venture even further from the self-dual sector, for example by studying maximally helicity violating (MHV) Yang-Mills amplitudes (which have two minus-helicity legs), have met with seemingly less well-behaved celestial OPEs that include both double poles and log terms [24,25]. Other related aspects of loop-level celestial amplitudes have been studied in [26][27][28][29].…”

Section: Jhep04(2024)099mentioning

confidence: 99%