arXiv subjects

Damiano Barcaro

Publications and source records attributed to Damiano Barcaro.

3 recordsLinked to original sources

arXiv2026

Collinear Factorization Violation and Reggeization

We derive an all-order soft-collinear subgraph factorization in the space-like collinear limits of amplitudes for single gluon pinched in the Glauber region. We show that these contributions exhibit Reggeization, combining aspects of both forward and hard scattering. By deforming away from the Glauber region wherever possible we demonstrate a dramatic simplification of the effective theory subgraphs and thereby drastically reducing the complexity in computing collinear factorization breaking terms in multi-point amplitudes. Our work is aided with development of new software tools initiating a systematic study of processes involving Glauber exchanges at a multi-loop level.

hep-ph↗

arXiv2025

The Central Emission Vertex of two gravitons

It has recently been shown that there exists an $s$-channel sequence of classical corrections to the $H$ diagram computed long ago by Amati, Ciafaloni and Veneziano. At leading logarithmic accuracy, those corrections feature the gravity BFKL kernel as a crucial element, and may be computed through either rapidity renormalisation group equations or amplitudes built through $s$-channel unitarity cuts. In this paper, we evaluate six-graviton amplitudes in next-to-multi-Regge kinematics, and compute for the first time the Central Emission Vertex for the emission of two gravitons, which is relevant to evaluate the corrections to the gravity BFKL kernel, and thus to go beyond the leading logarithmic accuracy.

hep-th↗

arXiv2024

Scattering waveforms for Kerr black holes from the soft expansion

In this thesis, I will study the classical scattering problem of two Kerr black holes in general relativity with novel quantum field theory techniques in the Post-Minkowskian (PM) expansion, generalizing the subleading soft theorem to the case of spinning particles. The leading order term in the soft expansion is uniquely determined by the universal Weinberg pole, but the subleading one depends on the angular momentum of the external particles and receives a new spin corrections for classically spinning black holes. Using this approach, I will compute the gravitational Compton amplitude, both in the quantum and classical theory. I will then compute the tree-level five-point amplitude of two spinning point particles emitting a graviton, using the spinor-helicity formalism combined with the soft expansion. Finally, I will use the KMOC formalism to derive the analytic time-domain waveform for the scattering of two Kerr black holes at leading order in the PM expansion.

hep-th↗