Riccardo Gonzo

Riccardo Gonzo
The University of Edinburgh | UoE · Higgs Centre for Theoretical Physics

Doctor of Philosophy

About

13
Publications
330
Reads
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107
Citations
Introduction
After completing my PhD on theoretical particle physics at Trinity College Dublin, I am currently working as a postdoc at the University of Edinburgh. I'm very interested in quantum field theory and its applications in the particle physics sector, especially regarding scattering amplitudes. I'm also attracted from numerical and symbolic computation, since I usually work both with programs like Mathematica and MATLAB and with programming languages like C++.
Additional affiliations
March 2018 - present
Trinity College Dublin
Position
  • PhD Student
Education
February 2018 - April 2022
Trinity College Dublin
Field of study
  • Theoretical particle physics
October 2015 - October 2017
University of Padova
Field of study
  • Theoretical physics
October 2012 - September 2015
University of Padova
Field of study
  • Physics

Publications

Publications (13)
Preprint
Full-text available
We show how to compute classical wave observables using quantum scattering amplitudes. We discuss observables both with incoming and with outgoing waves. The required classical limits are naturally described by coherent states of massless bosons. We recompute the classic gravitational deflection of light, and also show how to rederive Thomson scatt...
Preprint
Full-text available
We extend the Kerr-Schild double copy to the case of a probe particle moving in the Kerr-Schild background. In particular, we solve Wong's equations for a test color charge in a Coulomb non-Abelian potential ($\sqrt{\text{Schw}}$) and on the equatorial plane for the potential generated by a rotating disk of charge known as the single copy of the $\...
Preprint
Full-text available
We study the variance in the measurement of observables during scattering events, as computed using amplitudes. The classical regime, characterised by negligible uncertainty, emerges as a consequence of an infinite set of relationships among multileg, multiloop amplitudes in a momentum-transfer expansion. We discuss two non-trivial examples in deta...
Preprint
Full-text available
In the two-body scattering problem in general relativity, we study the final graviton particle distribution using a perturbative approach. We compute the mean, the variance and the factorial moments of the distribution from the expectation value of the graviton number operator in the KMOC formalism. For minimally coupled scalar particles, the leadi...
Preprint
Full-text available
Light-ray operators naturally arise from integrating Einstein equations at null infinity along the light-cone time. We associate light-ray operators to physical detectors on the celestial sphere and study their algebra in generic 4-dimensional QFTs of massless particles with integer spin. The algebra associated to the light-ray operators of hard mo...
Article
A bstract In the two-body scattering problem in general relativity, we study the final graviton particle distribution using a perturbative approach. We compute the mean, the variance and the factorial moments of the distribution from the expectation value of the graviton number operator in the KMOC formalism. For minimally coupled scalar particles,...
Article
Full-text available
We extend the Kerr-Schild double copy to the case of a probe particle moving in the Kerr-Schild background. In particular, we solve Wong’s equations for a test color charge in a Coulomb non-Abelian potential (Schw) and on the equatorial plane for the potential generated by a rotating disk of charge known as the single copy of the Kerr background (K...
Preprint
We consider the problem of estimating the power and position of an unknown transmitter using only observations on the received power for several sensors, without any directional information. We describe several existing propagation models, and we compute the Fisher in- formation for the free-space loss model. For more complex model, we present some...
Preprint
We consider the problem of estimating the power and position of an unknown transmitter using only observations on the received power for several sensors, without any directional information. We describe several existing propagation models, and we compute the Fisher in- formation for the free-space loss model. For more complex model, we present some...
Article
Full-text available
A bstract Light-ray operators naturally arise from integrating Einstein equations at null infinity along the light-cone time. We associate light-ray operators to physical detectors on the celestial sphere and we provide explicit expressions in perturbation theory for their hard modes using the steepest descent technique. We then study their algebra...
Article
Full-text available
In this paper we study the BMS symmetry of the celestial OPE of two positive helicity gravitons in Einstein theory in four dimensions. The celestial OPE is obtained by Mellin transforming the scattering amplitude in the (holomorphic) collinear limit. The collinear limit at leading order gives the singular term of the celestial OPE. We compute the f...
Preprint
Full-text available
In this paper we study the BMS symmetry of the celestial OPE of two positive helicity gravitons in Einstein theory in four dimensions. Celestial OPE is obtained by Mellin transforming the scattering amplitude in the (holomorphic) collinear limit. Collinear limit gives the leading term of the celestial OPE. We compute the first subleading correction...
Preprint
Full-text available
We study the connection between asymptotic symmetries in non-Abelian gauge theories and the generalised coherent states following from the application to QCD of the Faddeev-Kulish approach to asymptotic dynamics. We compute the large gauge transformation properties of the soft evolution operators and use this to define the quantum corrected, non-li...

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